Question

If the mean of the following data is 18. Find the missing frequency P.

x|10|15|20|25
f |5 |10| P | 8

Answer 1

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Answer 2

x |10|15|20|25
f |5|10|p|8
FX|50|150|20p|200
so Sigma f = 23+p.
so Sigma FX= 400+20p
mean= 18
400+20p/(23+p)=18
400+20p = 414+18p
20p-18p =414-400
2p=14
p=7

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