If the following frequency distribution shows the average number of students per teacher in the 50 major cities of Pakistan

Class Limits	Frequency
9-11	3
12 – 14	5
15 – 17	12
18 – 20	18
21 – 23	8
24 – 26	4

Table 1

Determine

• Range
• Mean Deviation
• Standard Deviation
• Relative Dispersion
• Variance
• Kurtosis