The mean of the following data is 21.6, find p xi- 6, 12, 18, 24, 30, 36 fi- 5, 4, p, 6, 4, 6
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Mean : The average.
6+12+18+24+30+36+5+4+p+6+4+6 / 12
=151+p / 12 = 21.6
= 151+p = 21.6*12
=151+p = 259.2
= p = 259.2-151
= p = 108.2
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