(a) From the distribution, given above, construct a frequency table.

Question

Class mark	12.5	17.5	22.5	27.5	32.5	37.5	42.5
Frequency	12	17	22	27	30	21	16

(a) From the distribution, given above, construct a frequency table.

(b) Use the table obtained in part (a) to draw: 

(i) a histogram,

(ii) an ogive

Answer 1

(a) Difference in consecutive class marks = 17.5 − 12.5 = 5

First class interval will be 10-15 and so on.

(b) Now plot the points (15,12), (20,29), (25,51), (30,78), (35,108), (40,129), (45,145) and join them to obtain an ogive.