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

total numbers are 15 so every time he takes 9 instead of 6 he adds 3 extra to the previous total
so previous total = \[15 \times 7\] and extra is 3 * 7 so find new total and divide by 15

any problem persists please ask

Answer 2

*sorry
he reads 7 instead of 9 so he adds 2

Answer 3

sum/15=7
sum=15*7=105
"mistakenly reads 6 of the numbers as 9 instead of 7" =>
6*2=12
Add 12 to original sum and calculate the average.