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Weight of running shoes is normally distributed with a mean of 12 ounces and a standard deviation of 0.5 ounces. a)What is the probability that

Weight of running shoes is normally distributed with a mean of 12 ounces and a standard deviation of 0.5 ounces.

a)What is the probability that a shoe weighs more than 13 ounces?

b)What must the standard deviation of weight be in order for the company to state that 99.9% of its shoes are less than 13 ounces?

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