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My sisiter-in-law manages a tim hortons coffee shop. According to her, the number of cups of...

My sisiter-in-law manages a tim hortons coffee shop. According to her, the number of cups of coffee sold every day is normally distributed with mean μ=7000 and standard deviation σ = 750.

1) Find a constant b such that there is a 5% chance that the total number of cups sold in a 5-day period will exceed b.

2) The probability is 0.47725 that the mean daily number of cups of coffee sold over an n-day period is between 6700 and 7000. What is n?

Math   Statistics-And-Probability   
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