Q. 54.4( 22 Votes )

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Answer : For median:

We have, total frequency, N = 400

N/2 = 400/2 = 200

Observe, cf = 216 is just greater than 200.

Thus, median class = 3000-3500

Median is given by Where,

L = Lower class limit of median class = 3000

N/2 = 200

cf = cumulative frequency of the class preceding median class = 130

f = frequency of the median class = 86

h = class interval of the median class = 500

Substituting these values in the formula of median, we get  Median = 3000 + 406.98

Median = 3406.98

Thus, the median is 3406.98 hours.

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