Answer:
Greater than 20
Explanation:
Since mean is the average number of students, the formula for calculating the mean attendance of students is expressed as;
Mean = total number of student/sample size
![\overline x = (\sum Xi)/(N)](https://img.qammunity.org/2021/formulas/mathematics/college/ukth6mo49ht71mpuvsamtngf2ipt4am1lm.png)
Given mean = 20
Since the question talks about the first four meetings, the sample size = 4
![20 = (\sum Xi)/(4)\\ \\\sum Xi = 20 * 4\\\\\sum Xi = 80](https://img.qammunity.org/2021/formulas/mathematics/high-school/ptvp2mxr1o80onefrznpd6mmqy0karlqy8.png)
Since the sum total of students for the first four meetings is 80, hence the number of students who attended the meeting is greater than 20