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One of the things I like to do in my free time is to bling things....

One of the things I like to do in my free time is to bling things. Unexpected, right? Before I put rhinestones on a cell phone cover, I have to paint it. It takes me on average 15 minutes with standard deviation of 2 minutes to paint and dry the surface. Then it takes me, on average 1 and half hours and standard deviation of 16 minutes to individually put rhinestones on the cover. Times are Normally Distributed.

a) What is the probability that I will complete my project in less than 100 minutes.

b) How much time should I set aside for my project if I want to be finished with certainty of 98.9 percent.

Math   Statistics-And-Probability   
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