Question 1053453: Last year the number of skate boards produced per day at a certain factory were normally distributed with a mean of 20,500 and a standard deviation of 55 skateboards. Answer all of the following
A. On what percent of the days last year did the factory produce 20,555 skateboards or fewer. (I think it's 84.1 percent)
B. On what percent of days last year did the factory produce 20,610 skateboards or more ( I think it's 97.5 percent)
C. On what percent of days last year did the factory produce 20,445 skateboards or fewer (I think it's 2.5 percent)
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! z=(x-mean)/sd
=(20555-20500)/55=1 and that would translate to 84.1%
20610-20500=110, and 110/55=2, and that translates to 97.7%
20445-20500=-55 and -55/55=-1, and that translates to 15.9% (the complement of 84.1%)
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