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The average operating time for a fully charged phone is 24 hours with a standard deviation of 3 hours. Assume that the operating time for
The average operating time for a fully charged phone is 24 hours with a standard deviation of 3 hours. Assume that the operating time for a fully charged phone is normally distributed. (a) (3 marks) Sketch the density curve describing the operating time for a fully charged phone, include the mean and the standard deviation. (b) (3 marks) What is the probability that a fully charged phone operates longer than 27 hours? (c) (3 marks) How long are the 25% longest operating times for fully charged phones? (d) (5 marks) What is the probability that the average operating time for 9 fully charged phones is below 23 hours
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