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Algebra Room 300 Ms. Josie

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Please sign in next to your name on the sheet by the door.

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I have pencils, pens, paper, if you need it.

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I will be available in my room from 12:00 - 12:30 for tutoring on Mondays and Wednesdays if you ever want extra help. (PLEASE LET ME KNOW AHEAD OF TIME)

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The day’s lesson and the homework will be posted to my website by the end of each day.

www.mrsmillersmathtutoring.com

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Always feel free to email me with any questions or concerns.

jmiller1@camdencc.edu

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Warm Up: You have 5 minutes to work on these problems. Then, we will go over them.

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Do these WITHOUT a calculator.

 

 

 

 

 

 

 

 

 

 

 

 

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Use the bar graph and circle graph below to answer problems 7 and 8.

Workbook page 23

  1. Name two expenses that combine to equal about one-half of Beverly’s yearly budget. Which graph did you use?
  1. Explain: In which situations is a circle graph most useful? Is which situations is a bar graph most useful?

HOMEWORK

 

 

 

A circle graph helps compare information to the whole. A bar graph helps compare categories of information.

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Use the table and scatter plot below for problems 3 and 4.

Workbook page 25

A company requires its employees to take a policy test every two years. Employees can study an online handbook that tracks hours. The results are listed in the table below.

  1. Complete the scatter plot using the data in the table.

HOMEWORK

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Use the table and scatter plot below for problems 3 and 4.

Workbook page 25

  1. Does the pattern on the scatter plot show a correlation between employees’ test scores and hours of study? If so, is the correlation positive of negative?

HOMEWORK

Yes

There is a Positive Correlation, more study time means a higher score

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Line Graphs

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A line graph is a graph that connects the plotted data points with a line. Line graphs are especially useful when showing how a quantity changes over time.

Workbook page 26

The line graph at the right shows the gross national income of the United States from 2005 to 2012.

The gross national income is the total value of goods and services produced by a nation. The dots represent data points.

From the graph, you can see that the gross national income has mostly increased over time, with only one period of decrease.

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Finding Information on a Line Graph

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Example: What was the approximate gross national income of the United States in 2008??

Workbook page 26

Step 1: Locate 2008 on the horizontal axis and find the data point directly above it.

Step 2: Read the value on the vertical axis closest to the data point.

 

 

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Use the line graph above (from the example) for problems 1 – 4.

Workbook page 26

 

  1. By about how much did gross national income increase from 2009 to 2012?
  1. In which year did the gross national income increase the most?
  1. In which year did the gross national income decrease?

 

 

 

 

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Use the line graph below for problems 5 – 8.

Workbook page 27

  1. About how much greater was the price of gasoline in February than in January?
  1. During which period did the price of gasoline remain constant longest?
  1. During which periods did the price of gasoline decrease?
  1. What was the overall change in price from February to November?

 

 

 

 

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Use the line graph below for problems 9 – 12.

Workbook page 27

  1. In which year did Japan first produce more cars than the United States?
  1. In which year did Germany first produce more cars than the United States?
  1. Which country’s share of the market remained the most constant from 1961 to 2011?
  1. Explain: Describe Japan’s share of the automobile market from 1961 to 2011.

HOMEWORK

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Finding the Mean

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A typical value is an amount that represents the values in a set of numbers. A typical value must fall within the series of numbers it represents. There are three common typical values in a set of numbers: mean, median, and mode.

Workbook page 28

When most people use the word average, they are talking about the mean. For a set of values that are similar to each other, the mean is what you want to know when you ask,

“About how much….?”

To find the mean, add the value in a set of data, and then divide the sum by the number of values in the set.

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Finding the Mean

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Example: Ella scores 14, 18, 11, and 16 points in her last 4 basketball games.

What is her scoring average?

Workbook page 28

Step 1

Find the mean.

Add the values in the set.

 

Step 2

Divide the sum by the number of values in the set.

 

 

The mean is not necessarily equal to any number in the set. However, it must fall within the range of the numbers in the set.

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Find the mean for each set of numbers.

Workbook page 28

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Solve.

Workbook page 28

 

 

HOMEWORK: 5 & 6

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Tonight’s homework:

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Page 27, numbers 9 – 12

Page 28, numbers 5 & 6