A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results
What is the sample mean service life for sample 2?
Definitions:
Zero-Coupon Bonds
Bonds that do not pay interest during their lifetime but are issued at a discount to their face value, thus generating profit at maturity.
Yield
The income return on an investment, such as the interest or dividends received, expressed as a percentage of the investment's cost or current market value.
Minimum Number
The lowest quantity or amount that is allowed, required, or desired.
Coupon Rate
The percentage rate of interest a bond yields annually, based on its nominal value.
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