Question

1) The lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15 days. Find the probability of a pregnancy lasting less than 250 days. 2) The lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15 days. Find the probability of a pregnancy lasting more than 300 days. 3) An airline knows from experience that the distribution of the number of suitcases that get lost each week on a certain route is approximately normal with u =15.5 and standard deviation=3.6. What is the probability that during a given week the airline will lose between 10 and 20 suitcases? 4) Assume that the salaries of elementary school teachers in the United States are normally distributed with a mean of $32,000 and a standard deviation of $3000. If a teacher is selected at random, find the probability that he or she makes less than $28,000. 5) Assume that blood pressure readings are normally distributed with u =120 and standard deviation =8.A blood pressure reading of 145 or more may require medical attention. What percent of people have a blood pressure reading greater than 145? 6) Assume that the heights of American men are normally distributed with a mean of 69.0 inches and a standard deviation of 2.8 inches. The U.S. Marine Corps requires that men have heights between 64 and 78 inches. Find the percent of men meeting these height requirements.

Answer 1

1 o u=2.60 o=15 P( less than 250 ) P(x(250) = P(Z < x-M) = Plze 200-268 کا = P(Z <-1.2) = 0.1151 HomeworkLib polly, I have to attempt frost Due to Question CSScanned with CamScanner