The mean of the following scores
30, 32, 34, 36, 38, 40 and 42
What is the mean deviation?
30, 32, 34, 36, 38, 40 and 42
What is the mean deviation?
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
Correct Answer: Option C
Explanation:
30, 32, 34, 36, 38, 40, 42 = 7 terms
Assumed mean = \(\frac{30 + 32 + 34 + 36 + 38 + 40 + 42}{7}\)
\(\frac{252}{7}\) = 36
Next we minus each value from the mean (36). Hence we have;
x x - \(\mu\) x - \(\mu\)
30 -6 6
32 -4 4
34 -2 2
36 0 0
38 2 2
40 4 4
42 6 6
Total 24
M.D = \(\sum\) \(\frac{|x - \mu |}{N}\) = \(\frac{24}{7}\) = 3.42
30, 32, 34, 36, 38, 40, 42 = 7 terms
Assumed mean = \(\frac{30 + 32 + 34 + 36 + 38 + 40 + 42}{7}\)
\(\frac{252}{7}\) = 36
Next we minus each value from the mean (36). Hence we have;
x x - \(\mu\) x - \(\mu\)
30 -6 6
32 -4 4
34 -2 2
36 0 0
38 2 2
40 4 4
42 6 6
Total 24
M.D = \(\sum\) \(\frac{|x - \mu |}{N}\) = \(\frac{24}{7}\) = 3.42