A random sample of 109 light bulbs had a mean life of x558

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Reference no: EM13613892

A random sample of 109 light bulbs had a mean life of x=558 hours with a standard deviation of o=32 hours. Construct a 90% confidence interval for the mean life, u, of all light bulbs of this type.

a. 553 hr < u< 563 hr

b. 552 hr < u< 564 hr

c.550 hr < u< 566 hr

d. 551 hr < u< 565 hr

Reference no: EM13613892

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