The amount of milk sold each day by a grocery store varies according to the Normal distribution with mean 126 gallons an

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answerhappygod
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The amount of milk sold each day by a grocery store varies according to the Normal distribution with mean 126 gallons an

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The amount of milk sold each day by a grocery store varies according to the Normal distribution with mean 126 gallons and standard deviation 11 gallons.
a) on a randomly-selected day, what is the probability that the grocery store sells at least 138 gallons? Round your answer to 3 decimal places.
b) over a span of 7 days (assuming the randomness requirement is not violated), what is the probability that the grocery store sells an average of at least 138 gallons? Round your answer to 4 decimal places, if needed.
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