A standard deviation of 1.9 pounds. what is the 95 percent, Ask an Expert

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38.8 < u < 50.5
find the sample mean, x.

A random sample of 101 light bulbs had a mean life of x=481 hours with a standard deviaiton of s=30 hours. Construct a 90 percent confidence interval for the mean life, u, of all light bulbs of this type.

32 packages are randomly selected from packages reveived by a parcel service. The sample has a mean weight of 23.0 pounds and a standard deviation of 1.9 pounds. What is the 95 percent confidence interval fro the true mean weight, u, of all packages received by the parcel service?

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