Whiteboardmaths.com © 2004 All rights reserved

Histograms for Continuous Data A histogram for continuous data is a frequency diagram that shows part of the number line on the horizontal axis …… 5 Frequency Length in cm Length of Objects Class Interval 4 to 6 This histogram has 5 Class Intervals each of class width 2 Class Interval 10 to 12 Modal Class

Frequency Time in minutes The Histogram below shows the times taken for some students to complete a cross-country race. Histograms for Continuous Data(1) Time Taken for Race Race

Histograms Frequency Time in minutes How many students took more than 30 minutes to complete the race? Histograms for Continuous Data(1) Time Taken for Race

Histograms Frequency Time in minutes How many students took less than 40 minutes to complete the race? Histograms for Continuous Data(1) Time Taken for Race

Histograms Frequency Time in minutes How many students took between 20 and 50 minutes to complete the race? Histograms for Continuous Data(1) Time Taken for Race

Histograms Frequency Time in minutes How many students in total took part in the race? Histograms for Continuous Data(1) Time Taken for Race

Histograms Frequency Time in minutes The graph clearly shows that some of the students must have taken 35 minutes to complete the race. True or false? Discuss. False Histograms for Continuous Data(1) Time Taken for Race

Histograms Frequency Time in minutes One of the students took 60 minutes to complete the race. True or false? Discuss. False Histograms for Continuous Data(1) Time Taken for Race

Temperature The histogram below shows the maximum daily temperature as recorded over a period of time by a gardener. Frequency Temperature ( o C) Histograms for Continuous Data(2) Maximum Daily Temperature

1. On how many days was the temperature recorded as being less than 18 o C? Histograms Frequency Temperature ( o C) Histograms for Continuous Data(2) Maximum Daily Temperature

2. On how many days was the temperature recorded as being greater than 22 o C? Histograms Frequency Temperature ( o C) Histograms for Continuous Data(2) Maximum Daily Temperature

3. On how many days was the temperature recorded as being between 14 and 26 o C ? Histograms Frequency Temperature ( o C) Histograms for Continuous Data(2) Maximum Daily Temperature

4. On how many days was the temperature recorded by the gardener? Histograms Frequency Temperature ( o C) Histograms for Continuous Data(2) Maximum Daily Temperature

5. On most days the temperature was between 14 and 18 o C. True or false? Discuss. Histograms Frequency Temperature ( o C) Histograms for Continuous Data(2) Maximum Daily Temperature False: The temperature was in that range on only 23 out of 68 days.

6. The histogram clearly shows that on most days the temperature was between 10 and 18 o C. True or false? Discuss. Histograms Frequency Temperature ( o C) Histograms for Continuous Data(2) Maximum Daily Temperature True: The temperature was in that range on 35 out of 68 days.

7. Which of the following statements is true. (a) The minimum temperature was 10 o C. (b) The maximum temperature was 32 o C. Histograms Frequency Temperature ( o C) None of them Histograms for Continuous Data(2) Maximum Daily Temperature

THE GREEN HOUSE: QUALITY FLORIST Drawing a Histogram Drawing

Too many! Too few! Between 6 and 9 class intervals looks best. 1. Choose suitable class intervals and display in a frequency table. The following data shows the height (as measured to the nearest cm) of a random selection of cut flowers from Beckys Flower Shop FrequencyTally Height (h) in cm Drawing a Histogram from raw data.

2. Complete the frequency table then draw the histogram. f h < h < h < h < h < h < 20 The following data shows the height (as measured to the nearest cm) of a random selection of cut flowers from Beckys Flower Shop FrequencyTally Height (h) in cm Drawing a Histogram from raw data. 1. Choose a suitable class intervals and display in a frequency table Height (cm) Heights of Flowers

Comparing Histograms Temperature City A f f The histograms below show the maximum daily temperature as recorded for two European cities over a 60 day period in the summer. One of the cities is 500 miles north of the other. Discuss. 10 Temperature o C Temperature o C Temperature City B Comparing

The following data shows the height (as measured to the nearest cm) of a random selection of cut flowers from Beckys Flower Shop FrequencyTally Height (h) in cm Drawing a Histogram from raw data. Worksheet