Guarantee: Battery Life Many people consider their smartphone to be essential! Communication, news maps, Internet, entertainment, photos, and just keeping current are all conveniently possible with a smart phone. However, the battery better be charged or the phone is useless. Battery life, of course, depends on the frequency, duration, and type of use. One study involving heavy use of the phones showed the mean of the batterylife to be 13.75 hours with a standard deviation of 2.2 hours. Then the battery needs to be recharged. Assume the battery life between charges is normally distributed.(a) Find the probability that with heavy use, the battery life exceeds 14 hours.(b) Inverse Normal Distribution You are planning your recharging schedule so that the probability your phone will die is no more than 5%. After how many hours should you plan to recharge your phone?
Guarantee: Battery Life Many people consider their smartphone to be essential! Communication, news maps, Internet, entertainment, photos, and just keeping current are all conveniently possible with a smart phone. However, the battery better be charged or the phone is useless. Battery life, of course, depends on the frequency, duration, and type of use. One study involving heavy use of the phones showed the mean of the battery
life to be 13.75 hours with a standard deviation of 2.2 hours. Then the battery needs to be recharged. Assume the battery life between charges is
(a) Find the probability that with heavy use, the battery life exceeds 14 hours.
(b) Inverse Normal Distribution You are planning your recharging schedule so that the probability your phone will die is no more than 5%. After how many hours should you plan to recharge your phone?
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