Q. 24.4( 23 Votes )

# <span lang="EN-US

Answer :

For mode:

Here, highest frequency is 61.

So, the modal class = 60-80

Mode is given by

Where,

L = Lower class limit of the modal class = 60

h = class interval of the modal class = 20

f1 = frequency of the modal class = 61

f0 = frequency of the class preceding the modal class = 52

f2 = frequency of the class succeeding the modal class = 38

Substituting values in the formula of mode,

Mode = 60 + 180/32

Mode = 60 + 5.625

Mode = 65.625

Thus, modal lifetime of the components is 65.625 years.

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