Average life expectancy, Suppose a certain brand of

Average life expectancy

Reference no: EM1390094

Suppose a certain brand of Westinghouse light bulbs has a population life expectancy of 3000 and a population standard deviation equal to 100. (Assume the distribution of the population is normal).

a) What is the probability that a sample of 30 light bulbs will have an average life expectancy of fewer than 2950 hours?

Reference no: EM1390094

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