Author Question: The time taken for a computer to boot up, X, follows a normal distribution with mean 30 seconds and ... (Read 129 times)

j.rubin · **on:** Jul 24, 2018

The time taken for a computer to boot up, X, follows a normal distribution with mean 30 seconds and standard deviation 5 seconds. What is the standardized score (z-score) for a boot-up of time x =35 seconds?
a. -2.0
b. 0.0
c. 1.0
d. 2.0

Question 2

The following ranges are possible 95 confidence intervals for the percentage of Americans who think they work too many hours. For which one of the confidence intervals could you conclude that a majority of the population thinks they work too many hours?
a. 41 to 49
b. 49 to 54
c. 42 to 51
d. 52 to 58