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7 January, 14:50

The average (arithmetic mean) of 4 numbers is more than 15 but less than 17. Which of the following could be the sum of these four numbers?

51

59

61

69

72

+3
Answers (1)
  1. 7 January, 14:55
    0
    The average of 4 numbers is more than 15 but less than 17

    If the average is 15, the total is 15x4 = 60

    If the average is 17, the total is 17x4 = 68

    Therefore the total must be between 60 and 68, the possible answer is 61.
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