The average of a set of 30 numbers is 25. If three numbers 13, 15 and 20 are discarded, then the average of the remaining numbers is
A12
B18
C24
D26
Answer:
D. 26
Read Explanation:
The average of a set of 30 numbers is 25
Sum of 30 numbers = 30 × 25 =750
If three numbers 13, 15 and 20 are discarded
The sum becomes = 750 - (13 + 15 + 20)
= 750 - 48
= 702
new average = 702/27
= 26