The question in our own words · page 11
The paper graphs four probability mass functions on \(x=1,2,3,4,5\):
- I \(0.1,\ 0.4,\ 0.4,\ 0.1,\ 0\)
- II \(0.1,\ 0.2,\ 0.3,\ 0.4,\ 0\)
- III \(0.45,\ 0.25,\ 0.15,\ 0.15,\ 0\)
- IV \(0.2\) at each of the five values
Which two have the same mean?
- AI and II
- BI and IV
- CII and III
- DII and IV
Source: VCAA 2025 VCE Mathematical Methods Examination 2, Section A, Question 18
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