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Making a Line Plot Collect data and put in chronological order Determine a scale and intervals If you have a small range, you should probably use intervals of 1 With larger scales, it is best to mark intervals every 2, 5, or 10 numbers. Ex. Scores on a math test Use a scale from 60 to 100 and intervals of 5 Ex. Scores on a math test

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Making a Line Plot Draw a horizontal line and mark the intervals Ex. Scores on a math test

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Making a Line Plot Mark an X above the number for each data point If a number is repeated, place one X above the other Ex. Scores on a math test X XX X XX X X X X X X XX X X X XX X X

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Making a Line Plot Count the number of data points and count the number of Xs to make sure you plotted each point! Ex. Scores on a math test X XX X XX X X X X X X XX X X X XX X X 22 data points 22 Xs

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Reading a Line Plot Understand the scale and interval Ex. This line plot has intervals of 2, so an X that falls between numbers would represent the median of those numbers. An X between the 6 and 8 would represent XXX X XX X X X X X XX

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Reading a Line Plot Finding the Minimum Minimum – smallest value XXX X XX X X X X X XX The minimum is the number represented by the first X 1 Do NOT just look at the numbers on the scale. The Minimum is NOT 0 The MINIMUM is 1

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Reading a Line Plot Finding the Maximum Maximum – greatest value XXX X XX X X X X X XX The maximum is the number represented by the last X 15 Do NOT just look at the numbers on the scale. The Maximum is NOT 16 The MAXIMUM is 15

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Reading a Line Plot Finding the Range Range – difference between highest value and lowest value XXX X XX X X X X X XX Subtract the number represented by the first X from the number represented by the last X = 14 Do NOT just look at the numbers on the scale. The Range is NOT 16 – 0 = 16 The RANGE is 14

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Reading a Line Plot Finding the Median Median – middle number when data is arranged in chronological order XXX X XX X X X X X XX Cross off the first and last X. Continue crossing off the first and last Xs until you reach the middle. The MEDIAN is 8

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Reading a Line Plot Finding the Median Median – middle number when data is arranged in chronological order XXX X XXXX X X XX If there are 2 numbers left in the middle, the median is the middle of those 2 numbers. The 2 middle numbers are 7 and 8, so the median is 7.5

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Reading a Line Plot Finding the Median Median – middle number when data is arranged in chronological order XXX X XX X X X X X XX If you get confused crossing off the Xs, list the numbers represented by the Xs in chronological order and cross them off

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Reading a Line Plot Finding the Mean Mean – average XXX X XX X X X X X XX Add all the data points and divide by the total number of data points Remember to include ALL the Xs 1 Continue for all data points Add Them Up! 98 Divide by the # of Xs 13 Xs so divide by 13 ÷ Round if you get a long decimal 7.5 The MEAN is 7.5

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