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RD Chapter 32 Mean and variance of a random variable Ex 32.2 Solutions

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1.

Findthe mean and standard deviation of each of the following probabilitydistributions:

xi :2 3 4

pi :2.2 0.5 0.3


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Findthe mean and standard deviation of each of the following probabilitydistributions:

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Question - 2 : -

Adiscrete random variable X has the probability distribution given below:

X : 0.5 1 1.5 2

P(X) : k k2 2k2 k

(i) Find thevalue of k.

(ii)Determine the mean of the distribution.

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