14. For a recent English exam, use the Normal model N ( 73, 9.2) to find the per

Question

14. For a recent English exam, use the Normal model N ( 73, 9.2) to find the percent of scores under 58. Round to the nearest tenth of percents

15. Assuming a Normal model applies, a town's average annual snowfall (in cm) is modeled by N( 43,2). Draw and label the Normal model. What percent of snowfall is between 39cm and 45 cm ?

16. An English instructor gave a final exam and found a mean score of 70 points and standard deviation of 5.1 points. Assume that A Normal model can be applied . Draw and and label for the exam scores. Then fond the percent of scores above 85.3 points

Explanation / Answer

14. Mean is 73 and sd is 9.2

P(x<58) =P(z<(58-73)/9.2)

P(x<58)=P(z<-1.63) =1-P(z<1.63)

from normal distribution table, we get 1-0.9484 =0.0516

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