CC-33 Frequency And Histograms

Adriana Montenegro

Elizabeth Rodriguez

Damian De La Rua

Valerie Ramirez

Brianna Felipe

Kevin To

Period: 1

POD

Baseball: The number of home runs by the batters in a local home run derby are listed below. What is a frequency table that represents the data?

7, 17, 14, 2, 7, 9, 5, 12, 3, 10, 4, 12, 7, 15

Home Runs Frequency

2-5 4

6-9 4

10-13 3

14-17 3

Vocabulary

Frequency: the rate at which something repeats over a period of time.

Frequency table: a table to record data on how many times something repeats.

Histogram: a diagram containing of rectangles that displays information on the variable they are asking you to solve.

Cumulative Frequency Table: tables that are used when you need to keep track of “ the number of observations made over several time intervals.”

Interval: A space of time between events of states

Notes on how to solve for frequency and making a frequency table.

Ok so now comes time to solve for FREQUENCY!

The quiz scores earned by 20 students are listed below. What is a frequency table that represents the data?

9 8 5 8 10 3 6 7 6 7

8 10 8 5 7 9 7 8 4 9

First, list the data listed above from least to greatest.

So, 3, 4, 5, 5, 6, 6, 7, 7, 7, 8, 8, 8, 8, 8, 9, 9, 10, 10

Then, set up some ranges for the numbers.

3-4, 5-6, 7-8, and 9,10.

Making the Frequency table from problem number 1.

ALMOST DONE!!!!!!!!!!!

Make the table.

Ranges Frequency

3-4 2

5-6 4

7-8 9

9-10 5

Making A Histogram

It is almost as if you were making a frequency table, but you are putting your information on a bar graph instead.

Use the intervals for the frequency table for the histogram

Draw a bar for each interval

Make the height of each bar equal to the frequency of its interval

The Bars should touch not overlap (make sure it does not happen) Label each axis.

Uniform

If the bars are roughly the same height, the histogram is uniform.

Symmetric

If a vertical line can divide the histogram into two parts that are close to mirror images, then the histogram is symmetric

Skewed

If the histogram has one peak that is not in the center, the histogram is skewed.

Example

The data below are the numbers of hours per week spent playing sports by a group of students. What is a histogram that represents the data?

2, 7, 17, 9, 6, 13, 8, 4, 6, 5, 12, 3, 11, 1, 8, 15 What type of histogram is this?

Skewed

Is Each Histogram Uniform, Symmetric, Or Skewed?

Skewed

Is Each Histogram Uniform, Symmetric, Or Skewed?

Symmetric

Is Each Histogram Uniform, Symmetric, Or Skewed?

Uniform

Classwork And Homework

Classwork: 163: 7-17

IXL: N1