Chapter 1
Numbers and Operations
Course: Gace Middle Grades Math 4 8 704
Subject: Gace Middle Grades Math 4 8 704
Chapter: Statistics And Probability
1. Solves for the mean and weighted average of given sets of data
The arithmetic mean is calculated by adding all the data values and dividing by the total number of values. It provides a balance point for the data set and is widely used because it incorporates every value. However, it can be strongly influenced by outliers.
Example: Suppose five students scored 60, 70, 80, 85, and 95 on a quiz. The mean is (60 + 70 + 80 + 85 + 95) ÷ 5 = 78. The interpretation is that if each student had the same score, that score would be 78.
Another example: Daily high temperatures for a week are 75, 80, 82, 85, 83, 78, and 90. The mean is 573 ÷ 7 = 81.9. Here the mean shows the “typical” daily high.