Question 126

# The average of 7 consecutive numbers is P. If the next three numbers are also added, the average shall

Solution

Let the 7 consecutive numbers be a-3, a-2, a-1, a, a+1, a+2 and a+3.
Sum of the numbers = 7a and the average of these numbers = a
If next 3 numbers a+4, 4+5 and a+6 are also added then the average of these 10  numbers = $$\dfrac{7a+a+4+a+5+a+6}{10} = a+1.5$$
Thus, the average increases by 1.5
Hence, option C is the correct answer.