Q. 34.6( 32 Votes )

# If the mean of the following frequency distribution is 7.2 find value of ‘K’.

Answer :

Given is the frequency distribution table for ungrouped data.

We have

Mean of such ungrouped data is given by

⇒

⇒ [∵ Mean = 7.2]

⇒ 7.2(40 + K) = 260 + 10K

⇒ 288 + 7.2K = 260 + 10K

⇒ 10K – 7.2K = 288 – 260

⇒ 2.8K = 28

⇒ K = 28/2.8

⇒ K = 10

Thus, K = 10.

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