Find out variance given that the AM = (8 + 4)/2

• 2

• 6

• 4

• 1

Coefficient of MD about mean for first 9 natural no. is

• 200/9

• 400/9

• 80

• 50

The quartile deviation is:

• 2/3 of SD

• 4/5 of SD

• 5/6 of SD

• none

If mean = 5, SD = 2.6, median = 5 & QD = 1.5, then

the coefficient of QD equals

• 35

• 39

• 30

• 32

If variance = 148.6 and x‾ = 40, then the coefficient of

variation is:

• 37.15

• 30.48

• 33.75

• none

If a variance of a random variable ‘x’ is 23, then what is

variance of 2x + 10?

• 56

• 33

• 46

• 92

If same amount is added to or subtracted from all the

values of an individual series then the standard deviation

and variance both shall be __

• changed

• unchanged

• same

• none

Standard Deviation for the marks obtained by a

student in monthly test in mathematic (out of 50) as

30,35,25,20,15 is

• 25

• √50

• √30

• 50

Coefficient of QD is 1/4 then Q3/Q1 is

• 5/3

• 4/3

• 3/4

• 3/5

S.D of first five consecutive natural numbers is

• √10

• √8

• √3

• √2