Considering the given scatter plot, it is found that:
a) The number of students who attended the fourth meeting is greater than 20.
b) Using a line of best fit, the estimate for the fourth meeting is an attendance of 17.67 students.
What is the mean?
The mean of a data-set is given by the sum of all observations in the data-set divided by the number of observations.
The first four observations are: 18, 21, 17 and x.
The mean is of 20, hence:
20 = (18 + 21 + 17 + x)/4
56 + x = 80
x = 24.
The number of students who attended the fourth meeting is greater than 20.
How to find the equation of linear regression using a calculator?
To find the equation, we need to insert the points (x,y) in the calculator.
For this problem, the points are given by:
(1, 18), (2,21), (3,17).
Hence, using a calculator, the line of best fit is given by:
y = -0.5x + 19.67.
The estimate for the fourth meeting is:
y = -0.5(4) + 19.67 = 17.67.
Using a line of best fit, the estimate for the fourth meeting is an attendance of 17.67 students.
More can be learned about scatter plots at https://brainly.com/question/22968877
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