5 In a certain northern Wisconsin town (cough...cough...Oliver), there are 100 families. 30 families have 1...

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5 In a certain northern Wisconsin town (cough...cough...Oliver),there are 100 families. 30 families have 1 child, 50 families have2 children, and 20 families have 3 children. The children are thenranked according to age: the oldest has rank 1, second oldest rank2, third oldest rank 3. Suppose you select a random child from thetown. Find the probability mass function, expected value, andvariance of the childs rank.

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X Childs RankPossible Value of X 123Number of Families 100Number of families with one child 30Number of children from the families with one child 30Number of children with rank 1 from the families with one child 30Number of families with 2 children 50Number of children from the families with 2 children 2 x 50100Number of    See Answer
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