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Please help. Interval Frequency Stock analysis. The price-earning ratios of 100 randomly selected stocks from the New York Stock Exchange are: -0.5-4.5 4.5-95 95-145 23

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Interval Frequency Stock analysis. The price-earning ratios of 100 randomly selected stocks from the New York Stock Exchange are: -0.5-4.5 4.5-95 95-145 23 14.5-19.5 19.5-24.5 NO- 5 24.5-29.5 29.5 -34.5 a. Find the mean of the price-earning ratios. 8.1 (Type an integer or a decimal. Round to two decimal places.) b. Find the standard deviation of the price-earning ratios. (Type an integer or a decimal. Round to two decimal places

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