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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Solution

Class Frequency Cumulative frequency

0-50 7 7

50-100 21-7=14 21

100-150 52-21=31 52

150-200 79-52=27 79

200-250 12 91

250-300 9 100

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Similar questions

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

The following table gives the lifetime in days of $100$ electricity tubes of a certain make:

Find the mean lifetime of electricity tubes by the step deviation method.

Mark	Cumulative Frequency
Less than 5 Less than 15 Less than 25 Less than 35 Less than 45 Less than 55 Less than 65 Less than 75	0 3 5 15 44 70 91 106

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