Exercise 5 Page 306

To find the median, make sure the scores are in numerical order.

Mean: 89.29
Median: 90

Practice makes perfect

We have data of Raul's 7 last golf games. Let's find the mean and the median of his scores.

Mean

In order to find the mean, or average, we need to find the sum of the scores and divide by the total number of games.

Mean=Sum of values/Number of values

SubstituteValues

Substitute values

Mean=84+94+93+89+94+81+90/7

AddTerms

Add terms

Mean=625/7

CalcQuot

Calculate quotient

Mean=89.285714...

RoundDec

Round to 2 decimal place(s)

Mean≈89.29

The mean of Raul's scores is approximately 89.29.

Median

The median of a set of data is the middle number, or the average of the two middle numbers, when placed in order from least to greatest. Let's start by writing the numbers in numerical order. 81, 84, 89, 90, 93, 94, 94 Since there is an odd number of scores, the median is the middle number, which is 90.

Subchapter links

Explore p.305-311

Elaborate p.311

Evaluate: Homework and Practice p.312-314

Lesson Performance Task

Exercise 5 Page 306

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Mean

Median