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Math · Statistics And Probability
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The weekly amount spent for maintenance and repairs in a certain company was observed, over a long period of time, to be approximately normally distributed with a mean of $400 and a standard deviation of $20.

A: If $450 is budgeted for next week, what is the probability that the actual costs will exceed the budgeted amount?

B: What is the 40th percentile for this distribution?

C: What is the probability next weeks costs will be equal to the average?

D: What is the probability next weeks costs will be under the amount budgeted but greater than $375?

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