The mean of seven numbers is 10. If six of the numbers ar...
The mean of seven numbers is 10. If six of the numbers are 2, 4, 8, 14, 16 and 18, find the mode.
6
8
14
2
Correct answer is B
Using x = ∑xN in each case, we get;
∑i=16xi = 10 x 7 = 70
∑i=17xi = 2 + 4 + 8 + 14 + 16 + 18 = 62
Hence the missing number can be obtained from
∑i=16xi−∑i=17xi = 70 - 62 = 8
So, all the seven numbers are 2, 4, 8, 8, 14, 16, 18
Mode = 8
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