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At the university's restaurant students spend for their lunch on average 7.50 with a standard deviation of 1.50. Assume these amounts of money are normally

At the university's restaurant students spend for their lunch on average 7.50 with a standard deviation of 1.50. Assume these amounts of money are normally distributed.

a) What percentage of students spend more than 8.00?

b) 10% of students spend more than A. Find A.

c) A class of 18 students enter the restaurant. Find the probability that they spend in total no more than 142.

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