The average of first 139 even numbers is
140
The first 139 even numbers are: 2, 4, 6, ..., 278. The average of an arithmetic series is given by:
Average = First term + Last term / 2
Average = (2 + 278) / 2 = 280 / 2 = 140
Thus, the average of the first 139 even numbers is 140.
Important Questions from Average
The average height of 20 students of class 8 is 152 cm and the average height of 15 students of class 9 is 168 cm. What is the average height (to the nearest cm) of the students of both classes?
The average of 4, 6, 8, 12 and x is 7 and the average of x, 9, 13, 15 and y is 9. What is the value of 2x - 3y?
The average weight of 20 girls in a school was 52 kg. Two new students of weight 54 kg and 50 kg were admitted. The ratio of this new average to the old one is:
If the average of two numbers is 13 and the square root of their product is 12, then the difference between the numbers is:
If the average of 5 consecutive odd integers in increasing order is 11 , then the average of the last 3 of them is:
