Math, asked by tandaleaastha, 2 months ago

From a survey of 20 families in a society, the following data was
obtained
No. of children
0
1
2
3
4
No. of families
5
11
20
2
For the random variable X = number of children in a randomly
chosen family, Find E(X) and V(X).​

Answers

Answered by patanemanav
2

Step-by-step explanation:

v(x) =1.2275 is the answer to the solution

Attachments:
Answered by bhuvna789456
5

Answer:

E(X)=\frac{23}{20}  and  V(X)=\frac{491}{400}

Step-by-step explanation:

The probability distribution of X is

Mean  =p_ix_i=\frac{23}{20}

Variance (X),=p_ix_i^2-(mean)^2

                      =\frac{51}{20}-(\frac{23}{20} )^2 =\frac{1020-529}{400} =\frac{491}{400}

Attachments:
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