SOLUTION: Suppose the battery life on an apple iPhone is approximately normally distributed with a mean of 7 hours and a standard deviation of 0.6 hours. Find the following: 1)What is the

Question 917014: Suppose the battery life on an apple iPhone is approximately normally distributed with a mean of 7 hours and a standard deviation of 0.6 hours. Find the following:
1)What is the probability that a fully charged phone will last somewhere between 4 and 5.9 hours?
2) what battery life time would seperate the bottom 30% from the rest of the life times?

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
Population: mean = 7hr, SD = .6hrs,
1) P(4 < x< 9) = P(-3/.6 < z < 2/.6) = normalcdf(-5, 3.3333) 0r .99957 - .00003 = .99954
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