In the given scatter plot we have total 10 points.
Now we have to determine how many are below 90 minutes to find how many groups completed the course in less than 90 minutes.
- First point is at 60 minutes.
- Second point is at 70 minutes.
- Third point is between 60 and 70 minutes.
- Fourth point is at 80 minutes.
- Fifth point is between 80 and 90 minutes.
So we can say that there are total 5 points below 90 minutes.
Answer : There are total five groups that completed the course in less than 90 minutes.