A population has a mean of 400 and a standard deviation of 80. Suppose a simple random sample of size 100 is selected and x? is used to estimate ?. Use z-table. a. What is the probability that the sample mean will be within ±9 of the population mean (to 4 decimals)? b. What is the probability that the sample mean will be within ±19 of the population mean (to 4 decimals)?
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We are given the population mean ($\mu$) and standard deviation ($\sigma$): $\mu = 400$ and $\sigma = 80$. Show more…
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