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

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Best answer

We have n = 400

So, n/2 = 400/2 = 200

The cumulative Frequency just greater than n/2 is 216 then the median class is 3000-3500 such that

the lower limit (l) = 3000

cumulative frequency of the class preceding 3000-3500 (cf) = 130

frequency of the median class 3000-3500 = 86,

class size (h) = 500

Using the formula,

= 3000 + 406.98

= 3406.98

So, median life time of lamps is 3406.98 hours

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