According to the U.S. bureau of Census, students require an average of 6.29 beyond high school to obtain a bachelors degree. Assume that the current time to obtain a bachelor’s degree has a normal distribution with a mean of 6.29 years and a standard deviation of 1.1 years (#'s 17 – 19) 'years (17) Determine the percentage of the time students will be required more than 5.19 years to obtain a bachelors degree? (18) Determine the percentage of students that take between 5 and 6 years to obtain a bachelor's degree? (19) In order for a student to receive their bachelors in the fastest 10%, determine the amount of time it will require

Suppose that the distance of fly balls hit to the outfield is normally distributed with a mean of 252 feet in a standard deviation of 50 feet find the 70th percentile of the distribution of the average of 49 fly balls

Manatees are one creature found in coastal waterways. 10 years ago, researchers concluded that the true mean weight of manatees was approximately 1050 lbs. This year, a random sample of 12 manatees were selected, the sample weights are: 956, 1012, 954, 988, 973, 1048, 1075, 1064, 856, 1026, 1031, 1064. Assume the underlying distribution of manatee weights is normal, and population standard deviation o is unknown.  Implement a hypothesis test to verify if there is any evidence to suggest the true mean weight decreases now. Solve the hypothesis using P-value method. Let a = 0.05. . Use the given sample data to calculate 90% confidence interval for true mean weight of manatees.

The lengths of a particular animal's pregnancies are approximately normally distributed, with mean = 251 days and standard deviation = 12 days. What proportion of pregnancies lasts between 248 and 257 days?