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

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

$$\bar{X}=80.125>79$$

So the mean is greater.

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

So the median is equal.

$$Mode=80$$

Hence, mode is also equal.