Question 121
The mean of 20 items is 55. If two items 45 and 30 are removed, the new mean of the remaining items is
Solution
The mean of 20 items is 55
=> Sum of 20 items = 55*20 = 1100
If 45 and 30 are removed
=> New sum = 1100-45-30 = 1025
and number of items remained = 20-2 = 18
=> New mean = $$\frac{1025}{18}$$ = 56.9
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