Question on: JAMB Mathematics - 2024
Find the standard deviation of 2, 3, 8, 10, and 12.
A
3.9
B
4.9
C
5.9
D
6.9
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Correct Option: A
Mean:
\[ \frac{2+3+8+10+12}{5} = 7 \]
Squared deviations:
- 25
- 16
- 1
- 9
- 25
Sum = 76
Variance:
\[ \frac{76}{5} = 15.2 \]
Standard deviation:
\[ \sqrt{15.2} \approx 3.90 \]
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