Question

The following table gives the life-time (in days) of 100 electric bulbs of a certain brand.

Life-time  (in days)	Less than 50	Less than 100	Less than 150	Less than 200	Less than 250	Less than 300
Number of bulbs	7	21	52	9	91	100

Answer 1

The frequency distribution is as follows:

Life-time (in days)	Frequency (f)
0 – 50	7
50 – 100	14
100 – 150	31
150 – 200	27
200 – 250	12
250 – 300	9