02 May 10. Ms. Libby Abby, Chief Personnel Officer For Alaska Oil & Gas Corporation Wants To Estimate The True Mean Time …
9. The registrar at the University of Hawaii studied the grade point averages (GPAs) of students over many years. She discovered that the distribution is approximately normal with a mean of1.89 and a standard deviation of0.25. (4pts)
a.What% of the students have a GPA of2.90 or more?
b.What% of the students have a GPA between 2.07 and 2.48?
c.What% of the students have GPA of 1.88 or less?
d.What percent of the students have a GPA of 1.89 or less?
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10. Ms. Libby Abby, Chief Personnel Officer for Alaska Oil & Gas Corporation wants to estimate the true mean time between occurrences of personnel accidents that might provide the potential for lawsuits. A random sample of forty-nine accidents is taken from the company’s records and the time between each accident and one preceding is recorded. This information revealed a sample mean of23 days and a standard deviation of 4 days. Find the 65% confidence interval for the population mean time between accidents. Assume the population standard deviation is known; use the “z” procedure.
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