7th Grade Math

Get ConnectED

Measures of Central Tendency

PART A B C

Multi-Part

Lesson 1

GLE 0706.5.4

Use descriptive statistics to

summarize and compare

data. SPI 0706.5.3 Calculate

and interpret the mean,

median, upper-quartile,

lower-quartile, and

interquartile range of a set

of data. Also addresses

GLE 0706.1.8.

Lesson 1C Measures of Central Tendency 497

Main Idea

Use technology to

calculate the mean,

median, and mode of

a set of data.

Spreadsheet Lab:

Mean, Median, Mode

ALLOWANCE Mrs. Jenson’s seventh-grade Allowance Per Week ($)

15 10 11 9 12.50

28 12 10 10 15

class was surveyed about how much

allowance each student receives each

week. The results are shown in the table.

Make a spreadsheet for the data and find

the mean, median, and mode.

Open a new spreadsheet. Create four columns labeled

DATA, MEAN, MEDIAN, and MODE.

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Use =AVERAGE (A2:A11)

to find the mean.

Use =MEDIAN (A2:A11)

to find the median.

Use =MODE (A2:A11)

to find the mode.

Enter each allowance amount in the DATA column.

In cell B2, enter =AVERAGE(A2:A11). In cell C2, enter

=MEDIAN(A2:A11). In cell D2, enter =MODE(A2:A11).

Each of these will find the mean, median, and mode of

the data set.

the Results

1. What data value is an extreme for the set? Explain your reasoning.


2. Describe how the measures of central tendency would change if
   the extreme value was not included in the data set.

490_497_C09_L1_895130.indd 497 1/11/10 9:31 AM