M1
2 marks · average 1.3 26% scored 0
The question in our own words · page 5
A discrete random variable \(X\) takes the values \(0,1,2,3\) with probabilities \(\frac4k,\ \frac{2k}{75},\ \frac{k}{75},\ \frac2k\), where \(k\) is a positive number. Show that \(k=10\) or \(k=15\). No calculator.
Source: VCAA 2025 VCE Mathematical Methods Examination 1, Question 4a
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