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mean=16
sum of frequency = 25+k
sum of (fixi) = 10 + 80 + 200 + 125 + 15k
= 415 + 15k
mean = sum of (fixi)/sum of frequency
16 = 415 + 15k/25 + k
= 400 + 16k = 415 + 15k
= 400- 415 = 15k - 16k
= -15 = -k
Hence k is equal to 15.
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