Higher
6th February 1970
- 1Conditional Probability3 marks
21 students study Spanish and 12 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 snail population of a hedgerow. State one assumption the method relies on.
- 3Standard Form3 marks
Work out (20 x 10^11) / (4 x 10^2). Give your answer in standard form.
- 4Quadratic Formula3 marks
Use the quadratic formula to solve 4x^2 - 4x - 1 = 0, to 2 decimal places.
- 5Direct and Inverse Proportion3 marks
y is directly proportional to x. When x = 4, y = 20. Work out y when x = 3.
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Any date always gives the same five questions, so a sheet can be set again or shared. All of February 1970, including the monthly compilation PDF.