Confidence Interval for Dave the Jogger

Dave the jogger runs the same route every day. On several consecutive days he recorded the number of steps he took using a pedometer, which ranged from 3,103 to 3,450. What sample size would you need to estimate Dave's mean steps with 95 percent confidence and an error of 25 steps? Explain your assumption about .

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...+ 3450)/2 = 3276.50

Also, 3s = 3450 - 3103 = 347

s = 347/3 = ...