Question

homework: unit 4 - pie charts and interpreting histograms
question 4, 7.1.15
the pictograph shows the annual number of wildfires in a region between 2000 and 2005. what was the average annual number of wildfires from 2003 to 2005?
the average annual number of wildfires was from 2003 to 2005.

Explanation:

Step1: Count fire - symbols for 2003 - 2005

2003 has 7 symbols, 2004 has 6 symbols, 2005 has 4 symbols.

Step2: Calculate total number of symbols

$7 + 6+4=17$ symbols.

Step3: Multiply by value of each symbol

Each symbol represents 12000 fires. So the total number of fires is $17\times12000 = 204000$ fires.

Step4: Calculate average

The time - period is 3 years. The average is $\frac{204000}{3}=68000$ fires.

Answer:

68000