Mathematics
Mathematics, 10.03.2020 01:36, abbz13

For a certain type of computer, the length of time between charges of the battery is normally distributed with a mean of 50 hours and a standard deviation of 15 hours.
(a) John owns one of these computers and wants to know the probability that the length of time will be between 50 and 70 hours.
(b) What is the probability that the length of time between charges is more than 67.5?
(c) What is the probability that the length of time between charges is less than 48?
(d) What length of time between charges should a computer have to be in the top 5% of the curve?

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