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The average price of 500 stocks included in the S&P 500 Index is $151 and the standard deviation is $15. Assuming that the stock prices

The average price of 500 stocks included in the S&P 500 Index is $151 and the standard deviation is $15. Assuming that the stock prices of these 500 stocks are normally distributed, find how many stocks' prices are (a) between $120 and $155 (b) more than $185.

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