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, kolet, by ALTS Corp Test Makeup Previous 11 12 13 14 15 16 17 18 19 20 Next Question 18 of 20 (1 point) In a study of the life expectancy of 500 people in a certain geographic region, the mean age at death was 72.0 years and the standard deviation was 5.3 years. If a sample of 50 people from this region is selected, find the probability that the mean life expectancy will be less than 70.4 years. Round intermediate :-value calculations to 2 decimal places and round the final answer to 4 decimal places. PCX-70.4)- Ti Show More Graw-Hill Connect.... Ehttps//ww-awh.co..

Explanation / Answer

Ans:

population std dev=5.3

sample size,n=50

standard error of mean=5.3/sqrt(50)=0.7495

z=(70.4-72)/0.7495=-2.13

P(z<-2.13)=0.0166

(without rounding off z value,P(z<-2.1347)=0.0164)

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