The page of senior citizens from a sample of 10 seniors are
Solution
Getting the mean, X,
X = Sum(x) / n
Sum(x) = 693
As n = 10
Thus,
X = 69.3
Setting up tables,
x x - X (x - X)^2
69 -0.3 0.09
71 1.7 2.89
63 -6.3 39.69
64 -5.3 28.09
68 -1.3 1.69
70 0.7 0.49
73 3.7 13.69
74 4.7 22.09
76 6.7 44.89
65 -4.3 18.49
Thus, Sum(x - X)^2 = 172.1
Thus, as
s^2 = Sum(x - X)^2 / (n - 1)
As n = 10
s^2 = 19.12222222
Thus,
s = 4.37289632
Thusm
coefficient of variation = s/mean = 0.063100957 = 0.06 [ANSWER, A]
