Find the Mean for Given Numbers
What is the mean of 1 ^ 2 + 2 ^ 2 + 3 ^ 2 + 4 ^ 2 + 5 ^ 2 + 6 ^ 2 + 7 ^ 2?
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1² + 2² + 3² + 4² + 5² + 6² + 7²
= 7×(7+1)×(2×7+1)/6
= 7×8×15/6
=140
Mean = 140/7 = 20
= 7×(7+1)×(2×7+1)/6
= 7×8×15/6
=140
Mean = 140/7 = 20
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