1. CC-33 Frequency And Histograms
Adriana Montenegro
Elizabeth Rodriguez
Damian De La Rua
Valerie Ramirez
Brianna Felipe
Kevin To
Period: 1

2. 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
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

4. 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?
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.

5. 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

6. 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.

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

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

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

10. 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

11. Is Each Histogram Uniform, Symmetric, Or Skewed?

12. Is Each Histogram Uniform, Symmetric, Or Skewed?

13. Is Each Histogram Uniform, Symmetric, Or Skewed?

14. Classwork And Homework
IXL: N1