Solve the Problem. -A Study of the Amount of Time It Takes a It

question 70

Multiple Choice

Solve the problem.
-A study of the amount of time it takes a mechanic to rebuild the transmission for a 2005 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours. If 40 mechanics are randomly selected,
Find the probability that their mean rebuild time exceeds 7.7 hours.

• A) 0.9712
• B) 0.9931
• C) 0.9634
• D) 0.8531

---

Definitions:

Significance Level

The probability of rejecting the null hypothesis in a statistical test when it is actually true, commonly denoted as alpha.

Sunshine

The light and warmth that comes from the sun, essential for life on Earth and influencing weather and climate.

Standard Error of Estimate

A measure of the accuracy of predictions made with a regression line, representing the average distance that the observed values fall from the regression line.

Gas Mileage

The distance a vehicle can travel per unit quantity of fuel.