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D Frequency Charts & Interval Ranges
供稿人: Cason

Tallies are a way to mark the occurance of a vote for a

catagory.  The number representing the tallies is a

frequency.  A cumulative frequency is a running total

of votes or occurances.  Study the frequency chart on

the next slide and prepare to complete your own.

 

Then complete the chart on the slide after next.  Now

click okay to continue.

Frequency charts
Tally            Frequency          Cumulative Frequency 

10

2

6

8

7

3

7 + 3 = 10
10 + 6 = 16
26 + 8 = 34
16 + 10 = 26
34 + 2 = 36

26

36

34

16

10

7
Tally            Frequency          Cumulative Frequency 

5

7

6

33

13

18

7
Tally            Frequency          Cumulative Frequency 

6

7

3

16

10

7

Again...

Tallies are a way to mark the occurance of a vote for a

catagory.  The number representing the tallies is a

frequency.  A cumulative                    is a running total

of votes or occurances.  This tells how many total votes

or occurances there were.  After reading this slide click

okay.

Frequency charts

Histograms are similar to bar graphs except they

group data into ranges.  This is handy when data can't 

easily be divided into categories.  An example would be

runners finishing a race. Times may be too spread out

for categories.  Therefore, intervals are used instead.

Your benchmark exams are divided into intervals of

20 as follows.

1-20

21-40

41-60

61-80

81-100

 

 

The interval range for this  data is        .

Each interval must have the same range.  When

we subtract the low from the high, we must have the

same range.  Complete the chart below.

10 - 14

15 - 19

20 - 24

5  -  9
0  -  4

The interval range is the high

of any  row minus the low

of the same row. 

The interval range for this  data is        .

9  - 12

13 - 16

17 -  20

5  -  8
1  -  4

The interval range is the high

of any  row minus the low

of the same row. 

The interval range for this  data is        .

  21   -   30

11   -   20

31   -   40

41   -   50

1   -   10

The interval range is the high

of any  row minus the low

of the same row. 

The interval range for this  data is        .

101   -  125

  51   -   75

26   -   50

76   -  100

1   -   25

The interval range is the high

of any  row minus the low

of the same row. 

Please complete the missing minimums

and maximums for the intervals below.

          -

21    -  40

61    -

41    -

1   -   20

Please complete the missing minimums

and maximums for the intervals below.

          -

26   -   50

        -

51    -

1   -   25

Please complete the missing minimums

and maximums for the intervals below.

          -

20    -   24

 

30    -

25   -

15   -   19

Please complete the missing minimums

and maximums an interval range of 19. 

          -

  8     -  

48    -

        -  

       -

107

Please complete the missing minimums

and maximums an interval range of 3. 

          -

  8     -  

        -

        -  

       -

  27

Please complete the missing minimums

and maximums an interval range of 14. 

          -

  8     -  

        -

        -  

       -

82

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