Higher Plus
23rd July 1971
- 1Direct and Inverse Proportion Depth3 marks
y is directly proportional to sqrt(x). When x = 4, y = 12. Work out y when x = 9.
- 2Finding the Area of Any Triangle3 marks
A triangle has sides of 11 cm and 11 cm and an area of 60.50 cm^2. Work out the acute angle between those two sides, to the nearest degree.
- 3Probability Equation Questions3 marks
A bag holds 7 counters, r of them red. Two are taken without replacement and P(both red) = 10/21. Work out r.
- 4Histograms3 marks
A histogram has four 10-wide classes from 0, with frequency densities 2, 3, 0.5, 1. Which class contains the median?
- 5Surds3 marks
Rationalise the denominator of 6/sqrt(2), giving your answer in its simplest form.
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Any date always gives the same five questions, so a sheet can be set again or shared. All of July 1971, including the monthly compilation PDF.