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 | 79 | 91 | 100 |
From this table, construct the frequency distribution table.
The frequency distribution table is:
LIFE TIME (in days) | NUMBER OF BULBS |
0 - 50 | 7 |
50 - 100 | 21 - 7 = 14 |
100 - 150 | 52 - 21 = 31 |
150 - 200 | 79 - 52 = 27 |
200 - 250 | 91 - 79 = 12 |
250 - 300 | 100 - 91 = 9 |