The average of 10 numbers is 85. If the numbers 70 and \(78\) are removed from the set of numbers, what is the average of the remaining numbers?
+189 We can say the sum of the 10 numbers in the first set is 85*10=850. Now we subtract 70 and 78 from 850 to get 850-70-78=702. We now divide by 10-2= 8 to get 702/8=87.75. So the new average is 87.75.
