Question:
The mean for the data 6, 7, 10, 12, 13, 4, 8, 12 is:
The mean for the data 6, 7, 10, 12, 13, 4, 8, 12 is:
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Pair numbers smartly (small + large) to speed up addition and reduce mistakes.
Updated On: May 1, 2026
- 9
- 8
- 7
- 6
- 5
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The Correct Option is A
Solution and Explanation
Concept: The arithmetic mean is: \[ \text{Mean} = \frac{\text{Sum of observations}}{\text{Number of observations}} \]
Step 1: Find the sum of all values.
\[ 6 + 7 + 10 + 12 + 13 + 4 + 8 + 12 \] Group for easy calculation: \[ (6+4) + (7+13) + (10+12+12) + 8 \] \[ = 10 + 20 + 34 + 8 = 72 \]
Step 2: Count total observations.
\[ n = 8 \]
Step 3: Calculate the mean.
\[ \text{Mean} = \frac{72}{8} \] \[ = 9 \]
Step 4: Final answer.
\[ \boxed{9} \]
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