Higher
31st July 1964
- 1Conditional Probability3 marks
23 students study Spanish and 9 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.
- 3Bounds2 marks
A mass is 450 kg, correct to the nearest 10. Write down the lower bound.
- 4Quadratic Formula3 marks
Work out the discriminant of 2x^2 + 2x + 4 = 0 and say how many real solutions it has.
- 5Direct and Inverse Proportion3 marks
y is directly proportional to x. When x = 8, y = 40. Work out y when x = 6.
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Any date always gives the same five questions, so a sheet can be set again or shared. All of July 1964, including the monthly compilation PDF.