Testing has been carried out on the length of time ( hours) that a new Brand X smartphone battery will work before the phone switches off because it needs charging. A large number of Brand X phone batteries were tested and t was found to be normally distributed with a mean life of 16.3 hours and a standard deviation of 2.4 hours. All batteries were fully charged before being tested. (a) The graph below represents the normal distribution for Brand X smartphone batteries. Write a number in each box to provide a partial scale for the distribution. 13.9 16.3 18.7 Battery life, (hours) Calculate the percentage of Brand X batteries that could be expected to last less than 15 hours 29.4 from Ned If 834 Brand X batteries were tested, how many could be expected to last less than 15 hours? 1245

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