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Recent questions tagged statistics
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1
GO2019FLT144
For two data sets, each of size $5$, the variances are given to be $4$ and $5$ and the corresponding means are given to be $2$ and $4$ respectively. The variance of the combined data is? $11/2$ $6$ $13/2$ $5/2$
asked
Dec 27, 2018
in
Probability
by
Ruturaj Mohanty
Active
(
2.7k
points)

244
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go2019flt1
statistics
variance
probability
+2
votes
1
answer
2
GO2019FLT153
A class of first year B.tech students is composed of four batches A, B, C and D, each consisting of $30$ students. It is found that the sessional marks of students in Engineering Drawing in batch C have a mean of $6.6$ and standard deviation of $2.3$. The mean and the standard ... Due to this, the marks of a student in batch C are changed from $8.5$ to $6.0$ $7.0$ $8.0$ $9.0$
asked
Dec 27, 2018
in
Probability
by
Ruturaj Mohanty
Active
(
2.7k
points)

199
views
go2019flt1
statistics
probability
0
votes
1
answer
3
GATE2017 CE1: GA5
The following sequence of numbers is arranged in increasing order: $1,x,x,x,y,y,9,16,18$. Given that the mean and median are equal, and are also equal to twice the mode, the value of $y$ is $5$ $6$ $7$ $8$
asked
Mar 26, 2018
in
Numerical Ability
by
Milicevic3306
Boss
(
17.2k
points)

101
views
gate2017ce1
generalaptitude
numericalability
statistics
+1
vote
1
answer
4
Previous Gate
The second moment of a Poissondistributed random variable is 2. The mean of the variable is .... My question on solving we get 2 values of lamda(ie mean) .One is 2 and the other is 1 .So which one to choose?
asked
Nov 23, 2017
in
Mathematical Logic
by
Kalpataru Bose
(
413
points)

837
views
mathematics
gate2015
engineeringmathematics
statistics
probability
poissondistribution
+1
vote
0
answers
5
Finding minima of function.
For what value of 'k' (in terms of $X_{i}$'s) following functions will attain their minimum value $\rightarrow$ $F_{1}(k)$ = $\sum_{i=0}^{n} \left  X_{i}  k \right $ $F_{2}(k)$ = $\sum_{i=0}^{n}\left ( X_{i}  k \right )^{2}$ If possible, please provide some valid proof for supporting your answer ?
asked
Nov 11, 2017
in
Probability
by
Chhotu
Boss
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13.6k
points)

74
views
engineeringmathematics
statistics
maximaminima
0
votes
1
answer
6
Doubt
the harmonic mean of two positive integers p and q is 3, given that [ (6p+1)/(7q4) ] <(p/q), what could be the value of q? a)q<=4 b)q>9 c)q<8 d)q>=13
asked
May 15, 2017
in
Numerical Ability
by
Angkit
Active
(
3.6k
points)

104
views
statistics
+1
vote
1
answer
7
GATE2017 ME1: GA4
In a company with $100$ employees, $45$ earn $Rs. 20,000$ per month, $25$ earn $Rs. 30000$, $20$ earn $Rs. 40000$, $8$ earn $Rs. 60000$, and $2$ earn $Rs. 150,000$. The median of the salaries is $Rs. 20,000$ $Rs. 30,000$ $Rs. 32,300$ $Rs. 40,000$
asked
Feb 27, 2017
in
Numerical Ability
by
Arjun
Veteran
(
430k
points)

73
views
gate2017me1
generalaptitude
numericalability
statistics
+3
votes
2
answers
8
GATE2016 ME2: GA6
Students taking an exam are divided into two groups, P and Q such that each group has the same number of students. The performance of each of the students in a test was evaluated out of $200$ marks. It was observed that the mean of group P was $105$, ... students of group Q scored marks in a narrower range than students in group P. The median of the marks of group P is $100$.
asked
Jan 20, 2017
in
Numerical Ability
by
makhdoom ghaya
Boss
(
30.7k
points)

835
views
gate2016me2
probability
statistics
+2
votes
1
answer
9
Standard Deviation
asked
Oct 22, 2016
in
Probability
by
KISHALAY DAS
Active
(
4.9k
points)

466
views
statistics
standarddeviation
+3
votes
3
answers
10
ISRO201474
What is the median of data if its mode is 15 and the mean is 30? 30 25 22.5 27.5
asked
Jun 27, 2016
in
Probability
by
Aryan
Junior
(
823
points)

2.7k
views
probability
statistics
meanmodemedian
isro2014
+4
votes
3
answers
11
ISRO201167
The arithmetic mean of attendance of 49 students of class A is 40% and that of 53 students of class B is 35%. Then the percentage of arithmetic mean of attendance of class A and B is 27.2% 50.25% 51.13% 37.4%
asked
Jun 23, 2016
in
Probability
by
jothee
Veteran
(
105k
points)

1.9k
views
isro2011
statistics
numericalability
+2
votes
1
answer
12
ISRO200965
If the mean of a normal frequency distribution of 1000 items is 25 and its standard deviation is 2.5, then its maximum ordinate is $\frac{1000}{\sqrt{2 \pi} } e^{25}$ $\frac{1000}{\sqrt{2 \pi} }$ $\frac{1000}{\sqrt{2 \pi} } e^{2.5}$ $\frac{400}{\sqrt{2 \pi} }$
asked
Jun 15, 2016
in
Probability
by
jothee
Veteran
(
105k
points)

1.9k
views
isro2009
statistics
normaldistribution
+6
votes
5
answers
13
GATE2014 EC1: GA4
The statistics of runs scored in a series by four batsmen are provided in the following table. Who is the most consistent batsman of these four? ... $K$ $L$ $M$ $N$
asked
Mar 18, 2016
in
Numerical Ability
by
makhdoom ghaya
Boss
(
30.7k
points)

1.6k
views
gate2014ec1
statistics
numericalability
+2
votes
2
answers
14
GATE2012 AE: GA5
The arithmetic mean of five different natural numbers is $12$. The largest possible value among the numbers is $12$ $40$ $50$ $60$
asked
Feb 16, 2016
in
Numerical Ability
by
Akash Kanase
Boss
(
41.9k
points)

449
views
gate2012ae
statistics
numericalability
+1
vote
1
answer
15
Subject Topic Probability
what is positively skewed ,symmetric and negatively skewed distribution?
asked
Dec 25, 2015
in
Probability
by
Amey
(
113
points)

438
views
statistics
probability
engineeringmathematics
+5
votes
2
answers
16
TIFR2015A15
Let $A$ and $B$ be nonempty disjoint sets of real numbers. Suppose that the average of the numbers in the first set is $\mu_{A}$ and the average of the numbers in the second set is $\mu_{B}$; let the corresponding variances be $v_{A}$ and $v_{B}$ ... $p.v_{A}+ (1  p). v_{B} + (\mu_{A} \mu_{B})^{2}$
asked
Dec 5, 2015
in
Numerical Ability
by
makhdoom ghaya
Boss
(
30.7k
points)

295
views
tifr2015
statistics
+3
votes
2
answers
17
statistics
Q) Let $x$ be normal variable with mean $8$ and standard deviation $4$ then $p(X\leq5)$ is A). Greater than zero but less than $0.5$ B). Greater than $0.75$ C). Greater than $0.5$ but less than $1$ D). Equal to $0.5$
asked
Dec 3, 2015
in
Probability
by
richa116
Active
(
1.9k
points)

556
views
statistics
+8
votes
2
answers
18
GATE201264
Which of the following assertions are CORRECT? P: Adding $7$ to each entry in a list adds $7$ to the mean of the list Q: Adding $7$ to each entry in a list adds $7$ to the standard deviation of the list R: Doubling each entry in a list doubles the mean of the list S: Doubling each entry in a list leaves the standard deviation of the list unchanged $P$, $Q$ $Q$, $R$ $P$, $R$ $R$, $S$
asked
Sep 29, 2014
in
Numerical Ability
by
gatecse
Boss
(
17.5k
points)

1.3k
views
gate2012
numericalability
statistics
normal
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