FREQUENCY TABLES, LINE PLOTS, & HISTOGRAMS

TERMS Frequency  number of times that something happens **The key here is that frequency is always about the NUMBER of times Frequency table  a table that shows the frequencies of items

EXAMPLE 1 A number cube was rolled 20 times. The results were: Make a frequency table of this data

EXAMPLE NumberTallyFrequency 1 II2 2IIII III IIII4

LINE PLOT To make a line plot: 1.Draw a number line that includes all the values (in example 1 this was 1,2,3,4,5,6) 2. Place an “X” above each number to indicate the number of times it occurs.

NumberTallyFrequency 1 II2 2IIII III IIII XXXX XXXXXXXX XXXXXXXX XXXXXX XXXXXX XXXXXXXX

HISTOGRAM A graph that shows the frequencies of the data **Looks like a bar graph.

EXAMPLE 2 The number incorrect on the latest quiz in Mr. Marvel’s algebra class

EXAMPLE Decide on an interval size (starts with 0 goes to 10)Interval size: 2

EXAMPLE Decide on an interval size (starts with 0 goes to 10)Interval size: 2 2. Make a frequency table

EXAMPLE 2 Number Incorrect TallyFrequency 0 – 1IIII II7 2 – 3IIII5 4 – 5IIII4 6 – 7I1 8 – 9II I

Number Incorrect TallyFrequency 0 – 1IIII II7 2 – 3IIII5 4 – 5IIII4 6 – 7I1 8 – 9II I1 5 0 – 1 2 – 3 4 – 5 6 – 7 8 – Number Incorrect Frequency Frequency for the Number Incorrect

Number Incorrect TallyFrequency 0 – 1IIII II7 2 – 3IIII5 4 – 5IIII4 6 – 7I1 8 – 9II I1 5 0 – 1 2 – 3 4 – 5 6 – 7 8 – Number Incorrect Frequency Frequency for the Number Incorrect

Number Incorrect TallyFrequency 0 – 1IIII II7 2 – 3IIII5 4 – 5IIII4 6 – 7I1 8 – 9II I1 5 0 – 1 2 – 3 4 – 5 6 – 7 8 – Number Incorrect Frequency Frequency for the Number Incorrect

Number Incorrect TallyFrequency 0 – 1IIII II7 2 – 3IIII5 4 – 5IIII4 6 – 7I1 8 – 9II I1 5 0 – 1 2 – 3 4 – 5 6 – 7 8 – Number Incorrect Frequency Frequency for the Number Incorrect

Number Incorrect TallyFrequency 0 – 1IIII II7 2 – 3IIII5 4 – 5IIII4 6 – 7I1 8 – 9II I1 5 0 – 1 2 – 3 4 – 5 6 – 7 8 – Number Incorrect Frequency Frequency for the Number Incorrect

Number Incorrect TallyFrequency 0 – 1IIII II7 2 – 3IIII5 4 – 5IIII4 6 – 7I1 8 – 9II I1 5 0 – 1 2 – 3 4 – 5 6 – 7 8 – Number Incorrect Frequency Frequency for the Number Incorrect

Number Incorrect TallyFrequency 0 – 1IIII II7 2 – 3IIII5 4 – 5IIII4 6 – 7I1 8 – 9II I1 5 0 – 1 2 – 3 4 – 5 6 – 7 8 – Number Incorrect Frequency Frequency for the Number Incorrect

Assignment 12.1: 1 – 17,