Question

the average of 15 numbers is 7. Angelo is adding these numbers and mistakenly reads 6 of the numbers as 9 instead of 7,what average will he get??..help plz..

Answer 1

this means six times he adds 2 more than he should....total of 12
so the sum is 12 higher than it should

sum = 15*7 - 12 = 93

avg = 93/15 = 6.2

Answer 2

6 times 2??why??

Answer 3

\[average=\frac{93}{15}=6\frac{3}{15}=6.2\]