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I don't understand how to do this. Suppose a normally distributed set of stock prices with 8900 observations has a mean of 124 and a

I don't understand how to do this.

Suppose a normally distributed set of stock prices with 8900 observations has a mean of 124 and a standard deviation of 12. Use the 68-95-99.7 Rule to determine the number of observations in the data set expected to be between the values 88 and 148.

Answer = (Round to the nearest whole observation.)

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