A student asks his mother for an upgrade for his phone, claiming the battery no longer holds an adequate charge. His mom decides to monitor the phone's battery life. The data she collects is shown below. Battery Life (%) Time (Hours) 100 88 2 2.75 83 3 81 4 73 5.5 64 What is the average rate of change of f(t) from hour O to hour 4? Enter your answer in the grid. (0) (O O (1)0

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