9. a manufacturer of computer terminals claims its products will last at least 2000 hours without needing repairs. data incorporated is considering purchasing a great many of their computer terminals. before agreeing to buy the manager of data, inc. randomly selected a sample of 81 records of the manufacturer’s terminals. the average time before the first breakdown was 1,980 hours with a standard deviation of 120 hours. what conclusion should the manager reached at the 5% level of significance?

In a high school with 3000 students, counselors are putting together a math tutoring program for the neighboring middle school. they plan to invite high school students with high average test scores to tutor middle school students, and they would like to offer gift cards to the student tutors. the counselors have a spreadsheet showing each student’s average test scores, and in order to find out how many gift cards they should purchase, the counselors need to count how many students would qualify to become tutors. which type of function would best the counselors determine the number of eligible students?