35
MCQ (Single Correct Answer)
Consider the numbers $1,2,3,4,5,6,7,8,9$, and 10 . If 1 is added to each number the variance of the numbers, so obtained is
A
6.5
B
2.87
C
3.87
D
8.25
36
MCQ (Single Correct Answer)
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
A
8.25
B
6.5
C
3.87
D
2.87
37
MCQ (Single Correct Answer)
The following information relates to a sample of size 60, $\Sigma x^2=18000$, and $\Sigma x=960$. Then, the variance is
A
6.63
B
16
C
22
D
44
38
MCQ (Single Correct Answer)
If the coefficient of variation of two distributions are 50, 60 and their arithmetic means are 30 and 25 respectively, then the difference of their standard deviation is
A
0
B
1
C
1.5
D
2.5
39
MCQ (Single Correct Answer)
The standard deviation of some temperature data in ${ }^{\circ} \mathrm{C}$ is 5 . If the data were converted into ${ }^{\circ} \mathrm{F}$, then the variance would be
A
81
B
57
C
36
D
25