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  4. A student obtain 75 %, 80 % and 85 % in three subjects. If the marks of another subject is added, then his average cannot be less than

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Q. A student obtain $75 \%, 80 \%$ and $85 \%$ in three subjects. If the marks of another subject is added, then his average cannot be less than

Statistics

Solution:

Marks obtained from three subjects out of $300$ is $75+80+85=240$
If the marks of another subject is added, then the marks will be $\geq 240$ out of $400$ .
$\therefore$ Minimum average marks $=\frac{240}{4}=60 \%$
[When marks in the fourth subject $=0$ ]