Suppose the Life of a Particular Brand of Calculator Battery

question 49

Multiple Choice

Suppose the life of a particular brand of calculator battery is approximately normally distributed with a mean of 75 hours and a standard deviation of 10 hours. What is the probability that a single battery randomly selected from the population will have a life between 70 and 80 hours?

• A) 0.2412
• B) 0.3830
• C) 0.1712
• D) 0.5121

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Definitions:

Nutrient Density

A measure of the nutrients provided by a food relative to its calorie content, emphasizing foods that are rich in vitamins, minerals, and other beneficial components with fewer calories.

Kilocalorie

A unit of energy often used in nutrition to quantify the energy content in food, equivalent to 1,000 calories.

Essential Nutrient

Nutrients required for normal body functioning that cannot be synthesized by the body and must be obtained from the diet.

Calories

A unit of energy that measures the amount of energy food provides to the body.