The price-eamings ratios for all companies whose shares are traded on a specific stock exchange follow a normal distribution with a atandard deviation of 3.9. A random sample of these companies is selected in order to estimate the population mean price-eamings ratio. Complete parts (a) through (c). a. 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 0.7 is less than 0.107 The sample size must be at least (Type a whole number.)

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