I am having problem to calculate some probability...please help me and explain to me how you get the answer(adsbygoogle = window.adsbygoogle || []).push({});

In order to use the labels in a competition a housewife removes the labels from 3 tins of tomato soup and from 4 tins of peaches, but forget to mark the tins which, without their labels are all identical. The housewife opens successive tins, chosen at random, looking for a tin of peaches. The random variable X denotes the number of tins opened up to and including the first tin of peaches.

Tabulate the probability distribution of X and show that var(X) = 16/25

Please help me i just don't know where to start..

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# Homework Help: Maths statistic(discrete)

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