Question

# The mean of the following frequency distribution is $$25.2$$. Find the missing frequency $$x$$$$C.I.$$$$0-10$$$$10-20$$$$20-30$$$$30-40$$$$40-50$$frequency$$8$$$$X$$$$10$$$$11$$$$9$$

Solution

## Solution -  C.I0-10 10-20 20-30 30-40 40-50  Frequency8 X 10 11 9.  Midvalue5 15 25 35 45 Mean = 25.2$$\frac{8\times 5+15x+10\times 25+11\times 35+9\times 45}{8+x+10+11+9} = 25.2$$$$1080+15x = 957.6+25.2x$$$$x= \frac{122.4}{10.2}$$$$x = 12.$$Mathematics

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