Author Question: Dave drives to work each morning at about the same time. His commute time is normally distributed ... (Read 92 times)

luminitza · **on:** Jul 25, 2018

Dave drives to work each morning at about the same time. His commute time is normally distributed with a mean of 46 minutes and a standard deviation of 5 minutes.

The percentage of time that his commute time exceeds 58 minutes is equal to the area under the standard normal curve that lies to the ___ of ___.
A) right, 2.4 B) left, 1.2 C) right, 12 D) left, 2.4

Question 2

A researcher wishes to estimate the proportion of all drivers who exceed the speed limit on a certain stretch of road where accidents frequently happen. Obtain a sample size that will ensure a margin of error of at most 0.

022 for a 92 confidence interval.
A) 20 B) 904 C) 35 D) 1582