Answer :

The probability that a man aged 60 will live to be 70 is 0.65

Using Bernoulli’s Trial we have,

P(Success=x) = nCx.px.q(n-x)

x=0, 1, 2, ………n and q = (1-p), n =8

p = 0.65 q =0.35

Probability that out of 10 men, now 60, at least 8 will live to be 70 is: P(8) + P(9) + P(10)

10C8(0.65)8(0.35)2 + 10C9(0.65)9(0.35)1 + 10C10(0.65)10(0.35)0


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