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Question 5:

Find the following table gives the distribution of the life time of 400 neon lamps:

Life time (in hours)

Number of lamps

1500 − 2000

14

2000 − 2500

56

2500 − 3000

60

3000 − 3500

86

3500 − 4000

74

4000 − 4500

62

4500 − 5000

48

Find the median life time of a lamp.

Answer:

Thecumulative frequencies with their respective class intervals are as follows.

Life time

Number of lamps (fi)

Cumulative frequency

1500 − 2000

14

14

2000 − 2500

56

14 + 56 = 70

2500 − 3000

60

...

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