Average Practice Test 5

Question : 18 of 40

Marks: +1, -0

The average of 8 numbers is 20. If one of the numbers is 18 and if it is replaced by 30, then the average becomes:

Solution:

Sum of numbers = 20 × 8 = 160
Difference = 12
New sum = 172
∴ Required average

=172/8 = 21.50

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