Mathematics, 21.05.2020 23:01 starbae1084

Suppose the shutter life of a population of DSLR cameras are normally distributed with an unknown population mean and a population standard deviation of 5,000 cycles. A random sample of DSLR cameras from the population produces a sample mean shutter life of x¯=89,200 cycles.

What value of z should be used to calculate a confidence interval with a 80% confidence level?

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