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Weekly demand at a grocery store for a brand of breakfast cereal is normally distributed with a mean of 1000 boxes and a standard deviation of 94 boxes

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Weekly demand at a grocery store for a brand of breakfast cereal is normally distributed with a mean of 1000 boxes and a standard deviation of 94 boxes. What is the probability that the weekly demand is:

a.    960 boxes or less?

b.    More than 1005 boxes?

c.     Between 750 and 850 boxes?