1 Press Ctrl-A ©G Dear 2008 – Not to be sold/Free to use Relative Error Stage 6 - Year 11 General Mathematics Preliminary

2 Relative Error – Example 1/4 Bill’s height is 167 cm. Between what values will it lie? The relative error is half of the smallest unit (1 cm). ie ± 0.5 cm Upper Limit = = cm Lower Limit = = cm

3 Relative Error – Example 2/4 Bill’s weighs is 77.6 kg. Between what values will it lie? The relative error is half of the smallest unit (0.1 kg). ie ± 0.05 kg Upper Limit = = kg Lower Limit = = kg

4 Relative Error – Example 3/4 Find Bill’s BMI. Between what values will it lie? in kilograms in meters Weight Height 2 BMI = = = 27.5 Normal = Overweight = Obese = 30

5 Relative Error – Example 4/4 Find Bill’s BMI. Between what values will it lie? Weight Height 2 BMI = = = 27.3 Using Upper-limit Weight Height 2 BMI = = = 27.6 Using Lower-limit BMI = 27.45