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5th September 1980
- 1Conditional Probability3 marks
18 students study Spanish and 10 of those also study Art. One Spanish student is picked at random. Work out the probability they study Art.
- 2Capture Recapture2 marks
A capture-recapture estimate is made of the ladybird population of a garden. State one assumption the method relies on.
- 3Fractional and Negative Indices2 marks
Write 8^-1 as a fraction.
- 4Solving Quadratics3 marks
Solve x^2 + 13x + 36 = 0.
- 5Direct and Inverse Proportion3 marks
y is directly proportional to x. When x = 5, y = 15. Work out y when x = 2.
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Any date always gives the same five questions, so a sheet can be set again or shared. All of September 1980, including the monthly compilation PDF.