**Answer:**

There is one outlier that indicates an unusually small number of assignments required in that class.

**Step-by-step explanation:**

Arranging the data is ascending order, we get:

4, 15, 15, 16, 17, 18, 20, 21, 22, 23, 23, 23, 24, 25

Lets divide the data in 4 equal parts to know the IQ ranges.

(4, 15, 15), 16, (17, 18, 20), (21, 22, 23), 23, (23, 24, 25)`

We can see that first interquartile range Q1 is 16

The third interquartile range Q3 is 23.

The IQR is

Lets check the interval [Q1-1.5(IQR),Q3+1.5(IQR)],

If any data lies in this interval, it will have no outliers.

[ = [5.5,33.5]

So, we can see that all the data except 4 lie in the interval [5.5,33.5].

Therefore, we can say that –

**B – There is one outlier that indicates an unusually small number of assignments required in that class.**