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.

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Solution

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

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

$\begin{matrix} L i f e - t i m e (i n d a y s) & L e s s t h a n 50 & L e s s t h a n 100 & L e s s t h a n 150 & L e s s t h a n 200 & L e s s t h a n 250 & L e s s t h a n 300 N u m b e r o f b u l b s & 7 & 21 & 52 & 79 & 91 & 100 \end{matrix}$

From this table,construct the frequency distribution table.

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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

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

​​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 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

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 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