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Presentation transcript:

Homework Turn it in now. Has everyone turned in his/her assignment?

Answers to 1 ClassesTallyFrequency 22-30IIII IIIII IIIII IIIII IIII IIII IIIIIIIII IIII4

Answers to 11 ClassesTallyFrequency 37-47IIIII IIIIIIIIII IIIIIII IIIIIIIIIII IIIIIIIIII IIIIII I1

Answers to the rest % % % %

Grading Write “graded by” and your name to that. Count the number of items correct out of 20.

Histograms Statistics Mrs. Spitz Fall 2009

Objectives Be able to construct a histogram given information in a problem. Determine the ratio of 2 objects Determine the percentage from a ratio.

Assignment Pg. 529 #21-32

Definition A bar graph that represents the data in a frequency distribution. The width of the bar represents each class, and the height of the bar corresponds to the frequency of the class.

Example 1 A survey of 105 households is conducted and the number of kilowatt hours (kWh) of electricity that are used by each in a one- month period is recorded in the frequency distribution, shown in the figure. The histogram follows.

Classes (kWh)Frequency , ,000-1, ,050-1, ,100-1, ,150-1,20010

Kilowatt Hours Number of Households

Example 2 The high temperatures at a ski resort during the 125-day ski season were recorded in a frequency distribution. The histogram for that is shown in the next slide. The temperature was between 15° and 20° on 15 days. Use Figure 11.2 to find the number of days the temperature was 45° or above.

Example 4 Use the histogram to find the number of days the temperature was 30° or below.

Example 4 Use the histogram to find the number of days the temperature was 30° or below.

Strategy Read the histogram Add the frequencies for the classes of , 15-20, 20-25, and Solution: = 47 So, the number of days the temperature was 30° or below was 47.

Assignment Pg. 529 #21-32