Calculate the standard deviation of the following marks; 2, 3, 6, 2, 5, 0, 4, 2
A
1.5
B
1.7
C
1.8
D
1.9
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
x
2
3
6
2
5
0
4
2
24
x - \(\bar{x}\)
-1
0
3
-1
2
-3
1
-1
\((x - \bar{x})^2\)
1
0
9
1
4
9
1
1
26
Mean = \(\frac{24}{8} = 3\)
Standard deviation = \(\sqrt{\frac{26}{8}}\)
= \(\sqrt{3.25}\)
= 1.802 \(\approx\) 1.8
Source: WAEC / JAMB / NECO Classroom Archive (Record #26443)