A Study of the Amount of Time It Takes a Mechanic

question 42

Multiple Choice

A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.77 hours.
Assume that a random sample of 40 mechanics is selected and the mean rebuild time of the sample is computed. Assuming the mean times are normally distributed, what percentage of sample means are greater than 7.7 hours?

• A) 0.62%
• B) 34.46%
• C) 65.54%
• D) 99.38%

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Definitions:

Retail Shelves

Retail Shelves are the physical spaces in stores where products are displayed for sale, playing a critical role in product visibility and accessibility to consumers.

Manufacturers

Entities engaged in the production of goods by transforming raw materials or components into finished products on a large scale.

Cost-Plus Pricing

A pricing strategy where a fixed percentage is added to the production cost to determine the selling price of a product or service.

Markup Percentage

A markup percentage is the amount added to the cost price of goods to cover overhead and profit.