Statistics MCQs

Page No. 53

A random variable may be _____________?


afixed


bcontinuous


cdiscrete


ddiscrete or continuous



If E(x) is the expected value of X then E[x – E(x)]= ___________________?


aE(x) – E(x)


bE(X) – 0


c0


dE(x) + E(x)


View Answer 0

Discrete random variable is real valued function defined on a ___________ sample space?


aDiscrete


bVariable


cScale


dNon


View Answer Discrete

If x is 4 and the distribution is 2, 3, 4, 5, 6, the sum of squared deviations from the x will be______________?


a8


b10


c6


d12


View Answer 10

A contractor employs 20 male, 15 female and 5 children in his factory. Male wages are Rs. 10 per day, female Rs. 8 per day, and children Rs. 3 per day. The weighted x of wages paid per day will be_____________?


a3.86


b8.37


c9.21


d10.63


View Answer 8.37

In a week the prices of a bag of rice were 350 ,280, 340, 290, 320, 310, 300. The range is_____________?


a60


b90


c70


d100


View Answer 70

If a distribution has two modes then this distribution is called______________?


aUni-Modal


b Bi-Modal


cTri-Modal


dMulti-Modal


View Answer Bi-Modal

The Harmonic Mean of any two numbers is________________?


aa+b2


b2aba+b


cab−−√


da+b


View Answer 2aba+b

Which of the following Measure of averages is affected by extreme (very small or very largE. values in data set?


aGeometric Mean


bMedian


c Arithmetic Mean


dHarmonic Mean


View Answer Arithmetic Mean

Geometric means of X1 and X2 is________________?


aX1+X2


bX1+X2x


cX1+X2−−−−−−−√


dX1×X2−−−−−−−√



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