Find the average of squares of consecutive even numbers from 1 to 20.
A154 ✓ Correct
B151
C155
D153
Correct answer: (A) 154
Explanation
The average is 154.
The even numbers up to 20 are 2, 4, 6, ..., 20, giving ten terms.
Their squares are 4, 16, 36, 64, 100, 144, 196, 256, 324, 400.
The sum of these squares is 1540.
Average = 1540/10 = 154.
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