66 Chapter 1 Whole Numbers 36 172 32 6 Skill Practice 13. The ages (in years) of 5 students in an algebra class are given here. Find the mean age. 22, 18, 22, 32, 46 Answer 13. 28 years b. Perform the operations within parentheses first.The guidelines indicate that we simplify the expression with the exponent before we subtract: Continue simplifying within parentheses. Add. 36 46 4. Computing a Mean (Average) The order of operations must be used when we compute an average. The technical term for the average of a list of numbers is the mean of the numbers. To find the mean of a set of numbers, first compute the sum of the values.Then divide the sum by the number of values. This is represented by the formula Computing a Mean (Average) Ashley took 6 tests in Chemistry. Find her mean (average) score. 89, 91, 72, 86, 94, 96 Solution: 89 91 72 86 94 96 Add the values in the list first. Divide. Average score 528 6 Ashley’s mean (average) score is 88. 88 6528 48 48 48 0 88 6 Example 5 Mean sum of the values number of values 82 72 49. 36 149 32 89 91 72 86 94 96 TIP: The division bar in is also a grouping symbol 6 and implies parentheses: 189 91 72 86 94 962 6 f —
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