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# Warm-Up PowerPoint PPT Presentation

Warm-Up. Find the mean, median, mode and range of each set of data. Which one, if any, do you think represents the data best? 5, 7, 8, 6 ,8, 9, 10, 8, 7, 5, 9, 9 7, 8, 9, 0, 7, 6, 8, 10, 8. 13.7 Stem and Leaf Plots and Histograms. Stem and Leaf Plot.

Warm-Up

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### Warm-Up

Find the mean, median, mode and range of each set of data. Which one, if any, do you think represents the data best?

5, 7, 8, 6 ,8, 9, 10, 8, 7, 5, 9, 9

7, 8, 9, 0, 7, 6, 8, 10, 8

## 13.7 Stem and Leaf Plots and Histograms

### Stem and Leaf Plot

*Leaves are only ever one digit, the last

*Stems can be more than one

*Must ALWAYS have a key

*Leaves must be in order

*Never skip stems, even if there are no digits to go with them

The number of home runs hit by the 20 baseball players with the best single-season batting averages in Major League Baseball since 1900 are listed below. Make a stem-and-leaf plot of the data.

14, 25, 8, 8, 7, 7, 19, 37, 39, 18, 42, 23, 4, 32, 14, 21,

3, 12, 19, 41

The back-to-back stem-and-leaf plot shows the ages of members of the U.S. men’s and women’s 2004 Olympic gymnastics teams. Compare the ages of the gymnasts on the two teams.

### Frequency Tables and Histograms

frequency: the number of data values in a specific interval

frequency table: used to organize date into the different intervals

histogram: a bar graph the displays data from a frequency table

*bars must have equal width

* height or length of the bar represents the frequency

* there is no space between the bars

The prices (in dollars) of sandwiches at a restaurant are listed below. Make a histogram of the data.

4.00, 4.00, 4.25, 4.50, 4.75, 4.25, 5.95, 5.50, 5.50, 5.75