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The price per kilo of a certain type of rice is normally distributed with an average of Php 35.5 and a standard deviation of

The price per kilo of a certain type of rice is normally distributed with an average of Php 35.5 and a standard deviation of Php 1.50. If the prices were gathered from 345 stores around Metro Manila, around how many stores will have a retail price that is more than one standard deviation away from the average?

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