A student obtains 75%,80%,and 85% in three su | vedclass

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(A) The sum of the percentages in $3$ subjects is $75 + 80 + 85 = 240$.Let the percentage in the fourth subject be $x$,where $0 \le x \le 100$.The ave

Vedclass · Accepted Answer

$60$

Vedclass · Answer

(A) The sum of the percentages in $3$ subjects is $75 + 80 + 85 = 240$.Let the percentage in the fourth subject be $x$,where $0 \le x \le 100$.The average of $4$ subjects is $\frac{240 + x}{4} = 60 + \frac{x}{4}$.Since the minimum possible value for $x$ is $0$,the minimum average is $\frac{240 + 0}{4} = 60\%$.Therefore,the average cannot be less than $60\%$.

Marks obtained	No. of students
$0-10$	$2$
$10-20$	$18$
$20-30$	$30$
$30-40$	$45$
$40-50$	$35$
$50-60$	$20$
$60-70$	$6$
$70-80$	$3$

$A$ student obtains $75\%$,$80\%$,and $85\%$ in three subjects. If the marks of a fourth subject are added,then his average cannot be less than.....$\%$

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