The average of 10 numbers is 42. If each number is increased by 5, them what will be the new average?
Answer & explanation
Correct answer: option 2
Average of 10 numbers = $\frac{sum of the numbers}{10}$
= 42(given)
Thus, sum of the numbers = 42 x 10 = 420
Now, each number is increased by 5, then total sum is increased by 5 x 10 = 50
New sum of the numbers = 420 + 50 = 470
New average = $\frac{470}{10}$ = 47