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Recent questions tagged probability
Webpage for Probability
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1
Probability Question
Source: https://www.facebook.com/photo.php?fbid=10156888790977640&set=gm.2199432896992966&type=3&theater
asked
4 days
ago
in
Probability
by
smsubham
Loyal
(
8.5k
points)

66
views
probability
engineeringmathematics
+1
vote
0
answers
2
GATE ECE 2014
asked
6 days
ago
in
Probability
by
aditi19
Active
(
2.1k
points)

31
views
2014ece
probability
uniformdistribution
+1
vote
1
answer
3
Rosen
What is the conditional probability that exactly four heads appear when a fair coin is flipped five times, given that the first flip came up heads? shouldn’t the answer be 1/16? my approach probability that we get 4 head after 4 toss=(1/2)^4 probability that outcome of first toss is head=½ P(A/B)=P(A ∩ B)/P(B)=$\frac{(1/2)^4*1/2}{1/2}$ answer is given ¼? where am I going wrong?
asked
Dec 1
in
Probability
by
aditi19
Active
(
2.1k
points)

50
views
kennethrosen
probability
conditionalprobability
0
votes
0
answers
4
Rosen
what is the probability that in a group of n people chosen at random, there are atleast two people born in the same month of the year?
asked
Dec 1
in
Probability
by
aditi19
Active
(
2.1k
points)

49
views
kennethrosen
probability
0
votes
0
answers
5
Doubt on conditional probability
It had been found from past experience that of the articles produced by a factory, 20% comes from Machine 1; 30% comes from Machine 2 and 50% from Machine 3. The percentages of satisfactory articles among those produced are 95 for machine 1, ... that is satisfactory? ii) Assume the article is satisfactory. What is the probability that it was produced by machine 1?
asked
Nov 30
in
Probability
by
Tuhin Dutta
Loyal
(
8.4k
points)

39
views
probability
conditionalprobability
engineeringmathematics
0
votes
1
answer
6
Doubt on probability
15 students among whom are A and B arranged randomly in a row. Obtain the probability that there will be 3 students between A and B?
asked
Nov 30
in
Probability
by
Tuhin Dutta
Loyal
(
8.4k
points)

40
views
probability
engineeringmathematics
+1
vote
1
answer
7
Probability
The probability of a student passing an exam is 0.1. What is the probability that he passes the exam in the 3rd attempt? Please explain in details. I am confused about these two approaches: Approach 1: P(passing in 3rd attempt)=P(failed in 1st)*P(failed in 2nd ... pass rate will always remain constant no matter on which attempt he is trying. ie. Answer = 0.1 Which one is wrong and why?
asked
Nov 28
in
Probability
by
punkprincess
(
47
points)

21
views
probability
0
votes
0
answers
8
Probability
From a deck of 52 cards, what is the probability of picking 2 kings: a)With replacement B)Without replacement Please explain in details. I am new to probability. Thank you. :)
asked
Nov 28
in
Probability
by
punkprincess
(
47
points)

19
views
probability
engineeringmathematics
+1
vote
1
answer
9
Probability
After practicing some problems in probability I have realized that I have confusions regarding problems of type "With replacement" and "Without replacement" To clarify my doubt I would like to see a detailed solution of the following problem : What is ... of selecting 2 Kings from the pack of 52 cards: 1. With replacement 2. Without replacement Can anyone help me?
asked
Nov 28
in
Probability
by
Nairit
(
115
points)

52
views
probability
0
votes
0
answers
10
EM_METest
I have a query here. For the case 4 when 4 tosses are made shouldn’t the probability be $\frac{1}{8}$ instead of $\frac{1}{16}$ because at 4th toss, it be might be HHHT, or HHHH(he makes atmost 4 tosses)? Please guide.
asked
Nov 26
in
Mathematical Logic
by
Ayush Upadhyaya
Boss
(
18.9k
points)

38
views
probability
0
votes
0
answers
11
ESE 2018
In a sample of 100 students, the mean of the marks (only integers) obtained by them in a test is 14 with its standard deviation of 2.5(marks obtained can be fitted with a normal distribution ).the percentage of students scoring 16 marks is a)36 b)23 c)12 d)10 (Area under standard normal curve between z=0 and z=0.6 is 0.2257 ; and between z=0 and z=1.0 is 0.3413)
asked
Nov 24
in
Probability
by
sim1234
(
209
points)

25
views
probability
+2
votes
1
answer
12
X and Y are two independent random variables
asked
Nov 24
in
Probability
by
sim1234
(
209
points)

133
views
probability
0
votes
1
answer
13
Probablity
Suppose each of three men at a party throws his hat into the center of the room. The hats are first mixed up and each man randomly selects a hat. what is the probability that a. All of three men select his own hat. b.None of three men select his own hats.
asked
Nov 23
in
Probability
by
kumar.dilip
Active
(
3k
points)

51
views
probability
engineeringmathematics
0
votes
0
answers
14
Self doubt
1) P(A/B) = P(A $\cap$ B) / P(B) 2) P(A/B) = P(B $\cap$ A) / P(B) What is the difference in this equation.. P(A $\cap$ B) and P(B $\cap$ A) are same ???
asked
Nov 20
in
Probability
by
jatin khachane 1
Active
(
3.3k
points)

33
views
probability
0
votes
0
answers
15
test series  Testbook
asked
Nov 18
in
Probability
by
monty
Active
(
1.1k
points)

51
views
testbooktestseries
engineeringmathematics
probability
uniformdistribution
+1
vote
0
answers
16
Continous Probability
Find the value of $\lambda$ such that function f(x) is valid probability density function $f(x)=\lambda (x1)(2x)$ for $1 \leq x \leq 2$ $=0$ otherwise My $\lambda$ is coming to be $ \frac{6}{5}$ Am I correct?
asked
Nov 15
in
Probability
by
Ayush Upadhyaya
Boss
(
18.9k
points)

84
views
probability
randomvariable
0
votes
1
answer
17
Probability
In four tests taken by 450 students, marks are found to be normally distributed with mean and variance as given below Test Id Mean Variance 1 74 121 2 75 100 3 78 196 4 82 169 A has secured 80 in the first test, 81 in the second, 86 in the third and ... fourth. In which test did A actually perform best relative to other students. (A)Fourth Test (B)Third Test (C)Second Test (D)First Test
asked
Nov 13
in
Probability
by
Ayush Upadhyaya
Boss
(
18.9k
points)

86
views
engineeringmathematics
probability
normaldistribution
0
votes
0
answers
18
Probability_#52
Consider the following probability mass function of a random variable X $p(X,q)=\{q\,\,if\,X=0 \\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1q\,\,\,if\,X=1\\ 0\,\,otherwise$ If q=0.4, the variance of X is.?
asked
Nov 8
in
Probability
by
Ayush Upadhyaya
Boss
(
18.9k
points)

38
views
probability
0
votes
1
answer
19
Made easy workbook
Suppose the random variable X has the probability distribution given below: X 2 1 0 1 2 P(X=X) 0.25 0.20 0.15 0.35 0.05 Let $Y=(2*(X^2))+6$.The expected value E(Y) is: A) 9.5 B) 6. C )15.5. D )18
asked
Nov 8
in
Probability
by
Gaurangi Katiyar
(
165
points)

77
views
randomvariable
probability
0
votes
0
answers
20
urn contains 30 red balls and 70 green balls
asked
Nov 2
in
Probability
by
MIRIYALA JEEVAN KUMA
Active
(
2.3k
points)

23
views
probability
engineeringmathematics
discretemathematics
0
votes
0
answers
21
Basic Probability
A person throwing a dice and when even have come he got $2$ points and when odd have come he got $1$ points.What is the probability when he got exactly $6$ points?
asked
Nov 2
in
Probability
by
Lakshman Patel RJIT
Boss
(
20k
points)

26
views
engineeringmathematics
probability
0
votes
1
answer
22
GATEME2018
asked
Oct 30
in
Probability
by
aditi19
Active
(
2.1k
points)

40
views
gate2018analysis
probability
0
votes
1
answer
23
GATEME2018
asked
Oct 30
in
Probability
by
aditi19
Active
(
2.1k
points)

50
views
gate2018analysis
probability
0
votes
0
answers
24
Consider an undirected random graph of eight vertices.
asked
Oct 30
in
Probability
by
Mk Utkarsh
Boss
(
29.6k
points)

54
views
probability
0
votes
0
answers
25
GATE 2014 MA RANDOM VARIABLES
asked
Oct 26
in
Probability
by
Balaji Jegan
Active
(
4.3k
points)

22
views
probability
0
votes
0
answers
26
GATE 2014 MA Random Variable
asked
Oct 26
in
Probability
by
Balaji Jegan
Active
(
4.3k
points)

18
views
probability
0
votes
0
answers
27
made easy test series
Consider Ramesh purchase a product of Patanjali. The manual on it states that the lifetime T of product is defined as the amount of time (in years) the product works properly until it breaks down, satisfy following equation: The probability that it breaks down in 3rd year is ________. 0 ... .22  0.23) Solution : 0.22 (0.22  0.23) i'm getting 0.134. what would be the answer?.
asked
Oct 24
in
Probability
by
aambazinga
Active
(
2.1k
points)

35
views
madeeasytestseries
probability
0
votes
1
answer
28
GATE ME 2018 Normal Distribution
Let X1, X2 be two independent normal random variables with means μ1, μ2 and standard deviations σ1, σ2 respectively. Consider Y =X1X2; µ1=µ2=1, σl=1, σ2=2. Then. (a) Y is normal distributed with mean 0 and variance 1 (b) Y is normally ... Y has mean 0 and variance 5, but is NOT normally distributed (d) Y has mean 0 and variance 1, but is NOT normally distributed
asked
Oct 16
in
Probability
by
aditi19
Active
(
2.1k
points)

83
views
probability
normaldistribution
+1
vote
1
answer
29
whichever is sooner
You roll two fair dice. If the sum of the numbers shown is 7 or 11, you win; if it is 2, 3, or 12, you lose. If it is any other number j, you continue to roll two dice until the sum is j or 7, whichever is sooner. If it is 7, you lose; if it is j, you win. What is the probability p that you win? Reference : Elementary probability by David Stirzaker
asked
Oct 9
in
Combinatory
by
MIRIYALA JEEVAN KUMA
Active
(
2.3k
points)

34
views
probability
+1
vote
0
answers
30
Each player drops out of the game immediately upon throwing a six.
asked
Oct 9
in
Combinatory
by
MIRIYALA JEEVAN KUMA
Active
(
2.3k
points)

9
views
probability
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