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Recent questions in Probability
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Random variables,
Uniform,
Normal,
Exponential,
Poisson
and
Binomial distributions.
Mean, median, mode and standard deviation.
Conditional probability and Bayes theorem
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Previous GATE
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1
Probability of error detection
A block of bits with n rows and m columns uses horizontal and vertical parity bits for error detection. If exactly 4 bits are in error during transmission, derive an expression for the probability that the error will be detected.
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16 hours
ago
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Probability
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Priyanka17
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1.3k
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7
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0
votes
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2
ISI paper
A block of bits with n rows and m columns uses horizontal and vertical parity bits for error detection. If exactly 4 bits are in error during transmission, derive an expression for the probability that the error will be detected.
asked
2 days
ago
in
Probability
by
Priyanka17
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1.3k
points)

11
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0
votes
1
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3
CMI Data Science 2018 (Probability)
asked
6 days
ago
in
Probability
by
Sayan Bose
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6.2k
points)

40
views
usercmi2018
probability
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0
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4
PGCET2010CS
The expected value of a probability function, when probability is measured on a scale of 0 to 1, coincides with it's (a) Mean (b) Variance (c) Standard deviation (d) None of them
asked
Apr 9
in
Probability
by
Prajna
(
77
points)

25
views
probability
0
votes
0
answers
5
SHELDON AND ROSS
Twelve percent of all US households are in California. A total of 3.3 percent of all US households earn over 250000 per year, while a total of 6.3 percent California households earn over 250000 per year. If a randomly chosen US household earns over 250,000 per year, ... 10^(3)/(0.033)=0.2291 But the answer given in the instructors manual is .2066 What is wrong with my logic??
asked
Mar 22
in
Probability
by
Doraemon
(
195
points)

24
views
probability
sheldonross
0
votes
2
answers
6
Probability  Independent Events
What is the probability that, in six throws of a die, there will be exactly one each of “1”, “2”, “3”, “4”, “5” and “6”? $0.00187220$ $0.01432110$ $0.01176210$ $0.01543210$
asked
Mar 8
in
Probability
by
zeeshanmohnavi
Junior
(
857
points)

56
views
probability
engineeringmathematics
0
votes
0
answers
7
Discrete random variable
asked
Feb 20
in
Probability
by
Na462
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8.7k
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78
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probability
randomvariable
engineeringmathematics
0
votes
0
answers
8
Central limit theorem
(Central Limit Theorem) Let X1, X2, . . . , X81 be i.i.d., each with expected value µ = E(Xi) = 5, and variance σ2 = Var(Xi) = 4. Approximate P(X1 + X2 +· · · X81 > 369), using the central limit theorem.
asked
Feb 19
in
Probability
by
Na462
Loyal
(
8.7k
points)

28
views
probability
0
votes
1
answer
9
Grewal
Suppose avg waiting time of a process to get chance in a queue is 5 min. What will the probability that process get chance at first minute is ________________
asked
Feb 19
in
Probability
by
srestha
Veteran
(
111k
points)

52
views
probability
0
votes
0
answers
10
Probability mass function
Suppose that the cdf of X is given by: F(a) ={ 0 for a < 0 1/5 for 0 ≤ a < 2 2/5 for 2 ≤ a < 4 1 for a ≥ 4. } Determine the pmf of X.
asked
Feb 19
in
Probability
by
Na462
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8.7k
points)

26
views
engineeringmathematics
randomvariable
+1
vote
0
answers
11
Probability density function
Let R be the rate at which customers are served in a queue. Suppose that R is exponential with pdf f(r) = 2e^(−2r) on [0, ∞). Find the pdf of the waiting time per customer T = 1/R.
asked
Feb 19
in
Probability
by
Na462
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8.7k
points)

20
views
engineeringmathematics
probability
0
votes
0
answers
12
Expectation
Suppose 100 people all toss a hat into a box and then proceed to randomly pick out a hat. What is the expected number of people to get their own hat back. Hint: express the number of people who get their own hat as a sum of random variables whose expected value is easy to compute.
asked
Feb 19
in
Probability
by
Na462
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8.7k
points)

44
views
#probability#expectation
probability
0
votes
1
answer
13
Conditional Probability
A multiple choice exam has 4 choices for each question. A student has studied enough so that the probability they will know the answer to a question is 0.5, the probability that they will be able to eliminate one choice is 0.25, otherwise ... the test to measure what the student knows. If the student answers a question correctly what's the probability they knew the answer?
asked
Feb 18
in
Probability
by
Na462
Loyal
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8.7k
points)

157
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conditionalprobability
probability
0
votes
1
answer
14
JEST 2019
Three dice are rolled independently. Probability of obtaining the difference from largest and smallest number as exactly 4 :
asked
Feb 18
in
Probability
by
Sayan Bose
Loyal
(
6.2k
points)

85
views
jest
probability
0
votes
1
answer
15
Conditional probability
Oscar has lost his dog in either forest A (with a priori probability 0.4) or in forest B (with a priori probability 0.6). On any given day, if the dog is in A and Oscar spends a day searching for it in A, the conditional probability that he will ﬁnd the dog that day is 0.25. ... +(1/2)*0.15; but the answer given is=(0.5*0.4*0.25)+(0.5*0.6*0.15); what is wrong with my logic?
asked
Feb 16
in
Probability
by
DIYA BASU
(
289
points)

76
views
conditionalprobability
0
votes
1
answer
16
JEST Sample Question 1c
If a fair die (with 6 faces) is cast twice, what is the probability that the two numbers obtained differ by 2? (A) 1/12 (B) 1/6 (C) 2/9 (D) 1/2
asked
Feb 15
in
Probability
by
sripo
Active
(
2.6k
points)

45
views
jest
probability
discretemathematics
+1
vote
0
answers
17
JEST Sample Question6
Two gamblers have an argument. The first one claims that if a fair coin is tossed repeatedly, getting two consecutive heads is very unlikely. The second, naturally, is denying this. They decide to settle this by an actual trial; if, within n coin tosses, ... demonstrated. What happens for larger values of n? Is it true that P (n) only increases with n? Justify your answer.
asked
Feb 15
in
Probability
by
sripo
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(
2.6k
points)

25
views
jest
engineeringmathematics
probability
0
votes
1
answer
18
Sheldon ross example 5f
A poker hand consists of 5 cards.If the cards have distinct consecutive values and are not all of the same suit,we say that hand is straight.For instance a hand consisting of the five of spades,six of spades,seven of spades,eight of spades and nine of hearts is a straight.What is the probability that one is dealt is a straight?
asked
Feb 14
in
Probability
by
rtalwar
(
207
points)

33
views
0
votes
1
answer
19
A family has two children. Given that one of the children is a boy, what is the probability that both children are boys?
asked
Feb 14
in
Probability
by
ShubhamSwarnkar
(
27
points)

147
views
probability
0
votes
1
answer
20
Probability
Bob has a peculiar pair of foursided dice. When he rolls the dice, the probability of any particular outcome is proportional to the sum of the results of each die. All outcomes that result in a particular sum are equally likely. (a) What is the probability of the ... Here what do we mean by the line  any particular outcome is proportional to the sum of the results of each die.
asked
Feb 13
in
Probability
by
DIYA BASU
(
289
points)

17
views
probability
0
votes
0
answers
21
Probability
Let 3 cards are drawn from a pack of 52 cards one by one without replacement then find the prob that 3 cards are drawn out of which 2 are ace Ace and one is King?
asked
Feb 13
in
Probability
by
rtalwar
(
207
points)

67
views
0
votes
0
answers
22
Expectation
How is E[X1/X>1]=E[X]. Please explain.
asked
Feb 12
in
Probability
by
DIYA BASU
(
289
points)

29
views
+3
votes
3
answers
23
GATE201947
Suppose $Y$ is distributed uniformly in the open interval $(1,6)$. The probability that the polynomial $3x^2 +6xY+3Y+6$ has only real roots is (rounded off to $1$ decimal place) _______
asked
Feb 7
in
Probability
by
Arjun
Veteran
(
395k
points)

2.3k
views
gate2019
numericalanswers
engineeringmathematics
probability
uniformdistribution
+1
vote
3
answers
24
GATE 2019 23
Q.23 Two numbers are chosen independently and uniformly at random from the set (1, 2,..., 13]. The probability (rounded off to 3 decimal places) that their 4bit (unsigned) binary representations have the same most significant bit is
asked
Feb 7
in
Probability
by
Ram Swaroop
Active
(
2.6k
points)

569
views
usergate2019
usermod
probability
numericalanswers
normal
0
votes
0
answers
25
Sheldon and Ross
Two balls each equally likely to be colored either red or blue, are put in an urn. At each stage one of the balls is randomly chosen, its color is noted, and it is then returned to the urn.if the first two balls chosen are colored red, what is the probability that a>both balls in the urn are colored red b>the next ball chosen will be red how to solve this?
asked
Feb 7
in
Probability
by
DIYA BASU
(
289
points)

67
views
0
votes
1
answer
26
query
Can someone provide me with the names of good resources for continuous random variable?
asked
Feb 6
in
Probability
by
DIYA BASU
(
289
points)

28
views
0
votes
0
answers
27
SHELDON AND ROSS
FOR Q30 WHAT IS THE ANSWER??
asked
Feb 4
in
Probability
by
DIYA BASU
(
289
points)

86
views
0
votes
0
answers
28
Self doubt
Suppose 3 batteries are choosen at random from a group of 3 new and 4 used but still working and 5 ddefective batteries what is the probability of choosing 3 defective batteries? why is(5C3)/(12C3 ) the correct answer and (5*4*3)/(12C3) not the correct answer??
asked
Feb 3
in
Probability
by
DIYA BASU
(
289
points)

71
views
0
votes
1
answer
29
Ace Test Series: Probability  Uniform Distribution
asked
Feb 2
in
Probability
by
Na462
Loyal
(
8.7k
points)

85
views
randomvariable
probability
expectation
uniformdistribution
acetestseries
0
votes
1
answer
30
Gate 2014 ec
A fair coin is tossed repeatedly till both head and appear atleast once. The average number of tosses required is?
asked
Jan 26
in
Probability
by
Vignaneswarkrishna
(
187
points)

92
views
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