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, Mobile Phones Marketing Professional. The average smartphone (powered by a 1500mAh battery) will have a normal battery life of around 10 to 14 hours depending on the usage you have. The main drains will be: screen, data connection, games, music and voice usage. Views Â· View Upvotes.
A random sample of 50 battery packs is selected and subjected to a life test. The average. life of these batteries is 4.05 hours. Assume that battery life is normally distributed with. standard deviation equal to 0.2 hours. Analysts wish to test the hypothesis that the mean. life of battery packs is bigger than 4 hours.