What is the mean of variable a? express answer to one decimal place.
scatter plot on a first quadrant coordinate grid. the horizontal axis is labeled variable a. the vertical axis is labeled variable b. points are plotted at (two, two), (two, eight), (four, three), (five, one), (six, three), (seven, five), (eight, six), (nine, two).

Variable A - horizontal axis ⇒ x
Variable B - vertical axis ⇒ y

points (x, y)
       A      B
1)    2 ,    2
2)    2 ,    8
3)    4 ,    3
4)    5 ,    1
5)    6 ,    3
6)    7 ,    5 
7)    8 ,    6
8)    9 ,    2

Mean of Variable A.
(2 + 2 + 4 + 5 + 6 + 7 + 8 + 9) ÷ 8 = 43 ÷ 8 = 5.375   OR  5.40

Mean is the average value of the data set. Add all the numbers in the data set and divide its sum by its count.