Mean of a freqency distribution is 54, s...

Mean of a freqency distribution is 54, `sumf_ix_i = 2200+5k` and `sumf_i = 40+k` . Find the value of k.

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If the mean of a frequency distribution is 8.1 sumf_ix_i= 133+5k and sumf_i = 30 , find the value of k.

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