If John had 11/14 and cindy got 92% who got the better mark?

To find the percent that 11/14 would be, divide 11 by 14 and see what you get

$$\frac{11}{14} \approx .79$$

Well, to turn this into a percent, move the decimal over two places to the right and add a percent sign

$$.79 = 79 \%$$

So it looks like Cindy got the better mark, because her percentage is higher and Johns.