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Question 2:

The following data gives the information on the observed lifetimes (in hours) of 225 electrical components:

Lifetimes (in hours)

0 − 20

20 − 40

40 − 60

60 − 80

80 − 100

100 − 120

Frequency

10

35

52

61

38

29

Determine the modal lifetimes of the components.

Answer:

From the data given above, it can be observed that the maximum class frequency is 61, belonging to class interval 60 − 80.

Therefore, m…

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