The Amount of Material Used in Making a Custom Sail

question 133

Multiple Choice

The amount of material used in making a custom sail for a sailboat is normally distributed with a standard deviation of 64 square feet.For a random sample of 15 sails,the mean amount of material used is 912 square feet.Which of the following represents a 99% confidence interval for the population mean amount of material used in a custom sail?

• A)912 ± 49.2
• B)912 ± 42.6
• C)912 ± 44.3
• D)912 ± 46.8

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