Higher Plus
1st August 1983
- 1Direct and Inverse Proportion Depth3 marks
y is directly proportional to sqrt(x). When x = 25, y = 35. Work out y when x = 81.
- 2The Cosine Rule3 marks
A triangle has sides 8 cm, 9 cm and 8 cm. Work out the angle opposite the 8 cm side, to 1 decimal place.
- 3Probability Equation Questions3 marks
A bag holds 5 red and n blue counters. The probability of taking a red is 5/12. Work out n.
- 4Histograms3 marks
A histogram has four 20-wide classes from 0, with frequency densities 3, 1, 0.5, 2. Which class contains the median?
- 5Bounds3 marks
A block has mass 870 g (to the nearest 10 g) and volume 20 cm^3 (to the nearest cm^3). Work out the upper bound of its density, to 2 decimal places.
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