find out the marks he secured in statistic.
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Let's say that the mean value given is "M"(15) and "S" is the mark obtained in statistics. Since the total number of subjects is 5 we divide the sum of all marks by 5.
So, (M=8+12+18+9+S)/5
=47+S/5
75=47+S
S=75-47
S=28
So, (M=8+12+18+9+S)/5
=47+S/5
75=47+S
S=75-47
S=28
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