$$ \overline X=\frac{61+76+79+80+80+84+91+90}{8} $$

$$ \overline X=\frac{641}{8} $$

$$ \overline X=80.125>79 $$

So the mean is greater.

$$ Median=\frac{80+80}{2}=80 $$

So the median is equal.

$$ Mode=80 $$

Hence, mode is also equal.