S1.2C Q3 - Answer at the bottom of this page

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Resources below: Key points | Similar-But-Different question with worked solution

Key Points

You need to be able to:

• Understand how to find class boundaries
• Remember that zero is usually a lower bound
• Remember that when you use interpolation with grouped frequencies then you must treat the data as continuous even if it is actually discrete. This is because interpolation assumes "the data values are evenly distributed within each class".

SBD S1.2C Q3

Answers

Median = 1.2 (1 d.p.)

Third quartile = 3.1 (1 d.p.)

Note that the 0-1 class upper boundary is 1.5  - see Key Point above.

Worked solution showing both the step-by-step method and the formula method