Question

32. There is a group of 20 persons who are rich, out of these 5 are helpful to poor people. Three persons are selected
at random, write the probability distribution for the selected persons who are helpful to poor people. Also, find the
mean of the distribution.
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Answer 1

Answer:

p(who help poor people)=no of people who help poor people/total no of people

p=5/20

p=1/4

Step-by-step explanation:

Answer 2

Probability distribution :  1 / 4.

Mean of distribution     : 1 / 2.

Given

A group of rich persons = 20   -----> P ( A )

A group of poor persons = 5   -----> P ( B )

To find the probability distribution for poor persons and mean of the distribution.

Probability distribution :

Probability distribution, P ( x ) = P ( B ) / P ( A )

                                                 = 5 / 20

                                                 = 1 / 4.

Mean of distribution :

Mean of distribution = n × P ( x )

where, n = number of types of persons ( Rich person and Poor person )

            n = 2.

Mean of distribution = 2 × ( 1 / 4 )

                                  = 2 / 4

                                  = 1 / 2.

To learn more...

There is a group of 20 persons who are rich, out of these 5 are helpful to poor people. Three persons are selected  at random, write the probability distribution for the selected persons who are helpful to poor people. Also, find the  mean of the distribution.

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