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Recent questions tagged variance
1
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0
answers
1
GATE Applied Mock Test
3 -1 1 2
yashpaneliya
asked
in
Probability
Jan 24
by
yashpaneliya
258
views
probability
normal-distribution
random-variable
variance
1
vote
0
answers
2
Random Variable
Let X and Y are two random variables with E(X)=10,E(Y)=20 and Var(X)=25,Var(Y)=36 and E(X.Y)=225. Now consider Z=aX-bY+1. Find a and b when E(Z)=1 and Var(Z)=1.
Shubhgupta
asked
in
Probability
Jan 3, 2019
by
Shubhgupta
417
views
engineering-mathematics
variance
expectation
4
votes
2
answers
3
GATE Overflow | Mock GATE | Test 1 | Question: 44
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? $11/2$ $6$ $13/2$ $5/2$
Ruturaj Mohanty
asked
in
Probability
Dec 27, 2018
by
Ruturaj Mohanty
696
views
go-mockgate-1
quantitative-aptitude
statistics
variance
probability
1
vote
1
answer
4
Testbook-testseries-probability
Prateek Raghuvanshi
asked
in
Probability
Aug 1, 2018
by
Prateek Raghuvanshi
230
views
variance
0
votes
1
answer
5
Variance
There are two data sets,each of size 5. The variances of those sets are 4 and 5; means are 2 and 4 respectively. If the sets are combined, what would be variance of combined data? (A) 10/11 (B) 11/13 (C) 11/2 (D) 13/11
ankitgupta.1729
asked
in
Probability
Dec 12, 2017
by
ankitgupta.1729
376
views
variance
1
vote
1
answer
6
Virtual Gate
Let X and Y be two independent random variables. Suppose, we know that Var(√5X − √2Y) = 15 and Var(−√2X + Y) = 6.5. Var(X) and Var(Y) are: (A) Var(X) = 2.5, Var(Y) = 2 (B) Var(X) = 2, Var(Y) = 2.5 (C) Var(X) = 3, Var(Y) = 1.5 (D) Var(X) = 1.5, Var(Y) = 2.5
Niharika 1
asked
in
Probability
Oct 21, 2016
by
Niharika 1
748
views
variance
random-variable
1
vote
1
answer
7
VARIANCE
The mean of 100 observation is 50 and there standard deviation is 5. The sum of all squares of all the observation is 1) 50000 2) 250000 3) 252500 4) 25500
priti
asked
in
Probability
Nov 21, 2015
by
priti
609
views
variance
1
vote
2
answers
8
Variance
consider the first 10 positive integers . If we multiply each number by -1 and then add 1 to each number , the variance of the numbers so obtained is 1) 6.5 2) 8.25 3) 3.87 4) 2.87
priti
asked
in
Probability
Nov 21, 2015
by
priti
547
views
variance
1
vote
1
answer
9
Variance
Variance of 1st n positive integers is a)(n2-1)/12 b)(n+1)/6 c)(n-1)(2n+1)/3 d)n(n-1)
dhingrak
asked
in
Probability
Jan 1, 2015
by
dhingrak
1.7k
views
variance
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