Which of the following is not a measure of dispersion?

(a)

Range

(b)

Standard deviation

(c)

Arithmetic mean

(d)

Variance

The range of the data 8, 8, 8, 8, 8. . . 8 is

(a)

0

(b)

1

(c)

8

(d)

3

The sum of all deviations of the data from its mean is

(a)

Always positive

(b)

always negative

(c)

zero

(d)

non-zero integer

A number x is chosen at random from -4, -3, -2, -1, 0, 1, 2, 3, 4 find the probability that |x| ≤ 4

(a)

0

(b)

1

(c)

\(\frac{1}{2}\)

(d)

\(\frac{1}{9}\)

which of the following is true?

(a)

0 ≤ p(∈) ≤ 1

(b)

p(∈) > 1

(c)

p(∈) < 0

(d)

\(-\frac { 1 }{ 2 } \ge P(\in )\le \frac { 1 }{ 2 } \)

IF the probability of the non-happening of a event is q, then the probability of happening of that event is 

(a)

1-q

(b)

q

(c)

q/2

(d)

∝q

The mean of first first 10 odd natural number is ___________

(a)

5

(b)

10

(c)

20

(d)

19

The standard deviation is the ____ of variance 

(a)

cube

(b)

square

(c)

square root

(d)

cube root

The variance of 5 values is 16. If each value is doubled them the standard deviation of new values is_______ 

(a)

4

(b)

8

(c)

32

(d)

16

The mean of a observation x₁, x₂, x₃, ......... x_n is \(\bar { x } \). If each observation is multiplied by p, there the mean of the new observations is ___________

(a)

\(\frac { \bar { x } }{ p } \)

(b)

p\(\bar { x } \)

(c)

\(\bar { x } \)

(d)

P+\(\bar { x } \)