If the average of 20, 40, 50, Y, and Z is 45, then what is the average of Y and Z?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 57.5.
The sum of given values = 20 + 40 + 50 + Y + Z = Y + Z + 110
We know that,
Average = Sum of observations/Number of observations
Sum = 45 × 5 = 235
Thus,
Y + Z + 110 = 225
and, Y + Z = 115
Hence,
The average of Y and Z = 115/2 = 57.5