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Envision Math 2.0: Grade 6, Volume 2

EM

Envision Math 2.0: Grade 6, Volume 2 View details

2. Summarize Data Using Mean, Median, Mode, and Range

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Exercise 4 Page 463

The mean of a data set is the sum of all values divided by the number of values in that set.

Mean Number of Boys = 13
Mean Number of Girls = 14

Practice makes perfect

Let's look at the given data set.

	Boys	Girls
Ms. Green	15	14
Mr. Nesbit	12	12
Ms. Jackson	12	16

We want to find the mean of the boys and the mean of the girls in three classes. Let's do those things one at a time.

Boys

The mean of a data set is calculated by finding the sum of all values in the set and then dividing by the number of values in the set. In this case, there are 3 values in the set that represent the number of boys in each class. Let's use them to calculate the mean!

Mean=Sum of values/Number of values

SubstituteValues

Substitute values

Mean=15+12+12/3

Add terms

Mean=39/3

Calculate quotient

Mean=13

Girls

In this case, there are 3 values in the set that represent the number of girls in each class. Let's use them to calculate the mean!

Mean=Sum of values/Number of values

SubstituteValues

Substitute values

Mean=14+12+16/3

Add terms

Mean=42/3

Calculate quotient

Mean=14

Subchapter links

Do You Understand? p.463

Do You Know How? p.463

Assessment Practice p.466