Question

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

Life-tine (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