The mean of 6 observations 13, 18, 31, 7, 15 and k is 17. The value of k is ______.

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The mean of 6 observations 13, 18, 31, 7, 15 and k is 17. The value of k is 18. Explanation: Mean = "Sum of observations"/6 So, sum = 17 $\times$ 6 = 102. Sum of given numbers = 13 + 18 + 31 + 7 + 15 = 84. Therefore, k = 102 – 84 = 18.

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