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I need help with this homework question The price-earnings ratios for all companies whose shares are traded on the TSX follow a normal distribution with

I need help with this homework question

The price-earnings ratios for all companies whose shares are traded on the TSX follow a normal distribution with a standard deviation of 4.8. A random sample of these companies is selected in order to estimate the population mean price-earnings ratio. How large a sample is necessary in order to ensure that the probability that the sample mean differs from the population mean by more than 2.0 is less than 2%

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