Question

10. Plot a histogram of the distribution of the Control-Out scores.

11. What is the overall mean Control-Out score? What is the

Answer 1

10. Histogram for the control out scores is given by :

Frequency Table Count 4 18 Class 7-17 18-28 29-39 40-50 51-61 62-72 23 20 11 2

25- 23 20 20 18 15- Frequency 11 10 5 4 N 0+ 7 18 62 73 29 40 51 Histogram (Frequency Diagram)

11.

The mean is given by :

Σ=1 X, n

and the standard deviation is given by :

ΣΕ (X, Χ) S = n

where n is the sample size

$Mean = \frac{2889}{78} = 37.03$

12874.88 S = = 12.84 78