If x̄ = 12, and ∑ x = 132, then n = _____?
- 11
- 12
- 13
- None of these
Explanation
Given:
x̄ (mean) = 12
∑x (sum) = 132
The formula for mean is:
x̄ = ∑x / n
Rearrange to find n:
n = ∑x / x̄
= 132 / 12
= 11
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