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In: Statistics and Probability

It is estimated that 10% of the general population will live past their 90th birthday. In...

It is estimated that 10% of the general population will live past their 90th birthday. In a graduating class of 742 high school seniors, find the following probabilites.(round your answer to four decimal places.) a.) 15 or more will live beyond their 90th birthday. b.) 30 or more will live beyod their 90th birthday. c.) between 25 and 35 will live beyond their 90th birthday. d.) more than 40 will live beyond their 90th birthday

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Ans

As np>=5 and n[(1-p)>=5 we can use normal approximation to mean

Mean = n*p = 742*0.1 = 74.2

Standard dev = (n*p*q)^0.5 = (742*0.1*0.9)^0.5 = 8.17

a)

b)

c)

d)

orchestra answered 1 year ago
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