Higher Plus
5th November 1989
- 1Probability Equation Questions3 marks
A bag holds 9 counters, r of them red. Two are taken without replacement and P(both red) = 5/18. Work out r.
- 2Histograms3 marks
A histogram has four 10-wide classes from 0, with frequency densities 0.5, 1, 2, 3. Which class contains the median?
- 3Bounds3 marks
x = 69 and y = 41, each correct to the nearest whole number. Work out the upper bound of x - y.
- 4Completing the Square3 marks
Work out the coordinates of the turning point of y = x^2 - 4x + 6.
- 5Direct and Inverse Proportion Depth3 marks
y is directly proportional to sqrt(x). When x = 16, y = 24. Work out y when x = 4.
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