Instruction 7.3 The Lifetimes of a Certain Brand of Light Bulbs Are

question 78

Essay

Instruction 7.3
The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1,600 hours and a standard deviation of 400 hours. A random sample of 64 of these light bulbs is taken.
-Referring to Instruction 7.3,the probability is 0.20 that the sample mean lifetime differs from the population mean lifetime by at least how many hours?

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Definitions:

Personal Stakes

The personalized interest or investment an individual has in an outcome or decision.

Power

The ability or capacity to direct or influence the behavior of others or the course of events.

Positive Force

An influence or factor that contributes positively to growth, development, or overall well-being.

Destructive Force

A power or influence that causes significant harm, damage, or demolition.