Find the variance of the number of couples surviving

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Reference no: EM131811796

Question: Suppose there are 50 married couples. After some years, 20 of these 100 people have died. Regard the 20 deaths as striking the 100 people at random find numerical expressions for:

a) the probability that a probability couple has survived:

b) the expected number of couples surviving:

c) the probability that two particular couples have survived:

d) the variance of the number of couples surviving.

Reference no: EM131811796

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