Question

A small group of students was asked, "How many units are you taking this semester?" The results were: 17, 15, 12, 17, 15, 15, 12. What is the mean?

A small group of students was asked, "How many units are you taking this semester?" The results were: 17, 15, 12, 17, 15, 15, 12. What is the range?

A small group of students was asked, "How many units are you taking this semester?" The results were: 17, 15, 12, 17, 15, 15, 12. What is the sample coefficient of variation?

Answer 1

a) Mean

10314.7 Σ2.

b) Range is

17-12 = 5

c)

n-1

  

2(17 - 14.7)2 3(15 14.7)2(12 - 14.7) 7-1

  

4.2378

$\sigma =\sqrt{4.2378}=2.06$

sample coefficient of variation is

σ 2.06 =0.14 μ= 14.7