Question

The table below shows the value of the main mineral exports from Kenya in the year 2016 in Kshs million.

Mineral	Value in Kshs Million
Titanium ore	13,300
Rutile	6,800
Soda ash	6,200
Ilmenite	3,400
Zircon	3,000
Gemstones	930

1.   
   1. Using a radius of 5 cm, draw a pie chart to represent the data above. 
   2. Calculate the percentage of the leading mineral export by value in year 2016. 
2.  
   1. State three disadvantages of using pie-charts to present statistical data.
   2. State two characteristics of compound bar graph.

Answer 1

1.  
   1.  
      
   2. Calculate the percentage of leading mineral export by value in year 2016 leading x 100 13300-930 =12370
      original
      12370 x 100 = 93%
      13300
2.  
   1.  
      • are time consuming due to calculation and measurement of angles
      • pie charts having very small values may be difficult to accurately represent
      • actual values represented by each component cannot be known.
   2.  
      • are made of two or more bars drawn vertically
      • bars are subdivided into various segments
      • different variables can be presented on one bar