Question

Find Q₁, Q₃, D₈, and P₆₇ of the following data:

Size of shares	4	4.5	5	5.5	6	6.5	7	7.5	8
Frequency	10	18	22	25	40	15	10	8	7

Answer 1

X	f	cf
4	10	10
4.5	18	28
5	22	50
5.5	25	75
6	40	115
6.5	15	130
7	10	140
7.5	8	148
8	7	155
	N = 155

= size of 39^th value = 5