p4 persons have average of 19 problity of persons having more then 20 value
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total value of p4 person =19×4=76
in this posiblity of more then 20 value is 3
and total no. of person is 4
probability of person having more then 20
value =3/4
in this posiblity of more then 20 value is 3
and total no. of person is 4
probability of person having more then 20
value =3/4
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