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If a quality control manager wants to estimate with 95% confidence, the mean life of light bulbs to within 20 hours and also assumes that

If a quality control manager wants to estimate with 95% confidence, the mean life of light bulbs to within 20 hours and also assumes that the population standard deviation is 100 hours, how many light bulbs need to be selected?

Select one:

a. 88

b. 97

c. 56

d. 69

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