Suppose that the ages of cars driven by employees at a company are normally distributed with a mean of 8 years and a standard deviation of 3.2 years. what is the z-score of a car that is 9.1 years old?

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

Which of the following of the following sets of side lengths could not form a triangle?

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?