Question 67

The average of 11 numbersis 10.9. If the average of the first six numbers is 10.5 and that of the last six numbersis 11.4, then the middle number is

Solution

Average of 11 numbers = 10.9

=> Sum of 11 numbers = $$10.9\times11=119.9$$

Similarly, sum of first six numbers = $$10.5\times6=63$$

and sum of last six numbers = $$11.4\times6=68.4$$

Thus, middle number = $$(63+68.4)-119.9=11.5$$

=> Ans - (A)

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