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the average grocery bill for a family of 4 is reported to be $132 per week. assume the distribution is normal and the standard deviation

the average grocery bill for a family of 4 is reported to be $132 per week. assume the distribution is normal and the standard deviation is known to be $18.

1) find the probability that an individual family spends greater than $131.

P(X>131)=?

2) find the probability that a randomly selected sample of 16 families spend greater than $131.

P(X >131)=?

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