# 12 Math questions

1. a) Each step should show the complete expression or equation rather than a piece of it.
2. b) Each new step should follow logically from the previous step, following rules of algebra.
3. c) Each newstep should be beneath the previousstep.
4. d) The equal sign, =, should only connect equal numbers or expressions.

1)  Examine the scatter plot below. State whether the data appears to be linear, curvilinear, or random:

2)  Examine the scatter plot below. State whether the data appears to be linear, curvilinear, or random:

3) Examine the scatter plot below. State whether the data appears to be linear, curvilinear, or random:

4)  Use the Desmos graphing calculator (https://www.desmos.com/calculator) to construct a scatter plot for the data given. State whether the relation appears to be linear, curvilinear, or random:

 X Y 8 8.6 11 8.5 31 6.7 42 5.9 62 4.2 68 4.1 70 4.3 82 3.6 86 2.9 100 1.7

5)  Use the Desmos graphing calculator(https://www.desmos.com/calculator) to construct a scatter plot for the data given. State whether the relation appears to be linear, curvilinear, or random:

 X Y 0.3 11 0.6 9.9 1.4 6.7 2.3 5.0 3.3 1.2 4.8 0.7 5.2 0.2 7.3 2.5 8.7 7.2 9.4 8.8

Problems 6 – 10:  You work in the marketing department at Apple and have been asked to give a presentation on the increase in iPhone sales since the first year they went on the market, 2007.  Given the information in the following table,answer each of the questions below.

 Year xYears since 2007 yApple iPhone sales worldwide (in million units per fiscal year) 2007 0 1.39 2008 1 11.63 2009 2 20.73 2010 3 39.99 2011 4 72.29 2012 5 125.05 2013 6 150.26 2014 7 169.22 2015 8 231.22 2016 9 211.88

Source:

6) Use the Desmos graphing calculator ( https://www.desmos.com/calculator ) to construct a scatter plot for the data given from 2007 to 2016 . Label the axes of the scatter plot to reflect the

information given in the table.

7)Determine the slope of the line through the data points given in 2007 and 2016. Write the

slope in decimal form, rounding to thenearest hundredth of a million/year.

8)Write an equation in slope-intercept form of the line through the data points given in 2007

and 2016.

9)Add the line with equation found in #8 to your graph of the scatter plot. Does this line

appear to be a good model for the data in this scatter plot? Why or why not?

10)Using the equation found in #8, predict the number of iPhone sales in the year 2020.

11) You recorded the time in seconds it took for 4 participants to solve a puzzle. The times were: 29.4, 15.2, 22.1, 19.3. Please show your work and solve:

1. The mean is 21.5 seconds. Calculate the standard deviation.

1. Calculate the range.

1. FInd the median.

12) You are considering a move to Seattle, Washington.  There is a common belief that it rains a lot in Seattle, Washington, particularly when compared to other parts of the United States.  The question is: Is Seattle really as rainy as perceived to be?

The following table contains Average Monthly Precipitation Totals, in inches, for the years 1981-2010 (NOAA Data: ​http://www.ncdc.noaa.gov/cdo-web/datatools/normals​): Please show your work and solve:

 City Minimum Q1 Median Q3 Maximim Mean Standard Deviation Seattle, Washington 0.7 1.55 3.1 4.13 6.57 3.12 1.93 Atlanta, Georgia 3.36 3.84 4.03 4.52 5.27 4.14 0.57

1. Based on the fact that the median for Seattle is 3.1 and for Atlanta is 4.03, which city has higher percentage of months that get greater than 3.1 inches of precipitation?

Last Updated on January 1, 2021

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