The Average Lifetime of a Light Bulb Is 3,000 Hours

question 90

Short Answer

The average lifetime of a light bulb is 3,000 hours with a standard deviation of 696 hours. A simple random sample of 36 bulbs is taken.
a. What are the expected value, standard deviation, and shape of the sampling distribution of ?
b. What is the probability that the average life in the sample will be between 2,670.56 and 2,809.76 hours?
c. What is the probability that the average life in the sample will be greater than 3,219.24 hours?
d. What is the probability that the average life in the sample will be less than 3,180.96 hours?

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Definitions:

Exchange Theory

A social psychology and sociological perspective that explains human behavior in terms of the exchange of goods, services, and other benefits between people.

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Various forms of abuse or violence, including physical, emotional, and sexual, that occur within family relationships.

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