An air conditioning contractor has kept detailed records on the lifetimes of a random sample of 250.
An air conditioning contractor has kept detailed records on the lifetimes of a random sample of 250 compressors. She plans to use the sample mean lifetime, x, of those 250 compressors as her estimate or he population mea lifetime μ o al such compressors if the e meso this randon compressor avea standard deviation of 30 months, what is the probability that the contractor's estimate will be within 7 months of the true mean? The probability is (Round to four decimal places as needed.) Apr 06 2022 12:57 PM
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