Higher Plus
11th January 1984
- 1Proof of the Circle Theorems2 marks
In a circle theorem proof, a step uses the fact that two tangents are drawn to a circle from the same external point. State the reason being quoted.
- 2Probability Equation Questions3 marks
A bag holds 10 counters, r of them red. Two are taken without replacement and P(both red) = 7/15. Work out r.
- 3Histograms2 marks
On a histogram, a 4-wide bar and a 16-wide bar have the same frequency density of 3. How many more values are in the wider class?
- 4Bounds3 marks
A rectangle is 12 cm by 9 cm, each correct to the nearest cm. Work out the upper bound of its area.
- 5Completing the Square3 marks
Work out the coordinates of the turning point of y = x^2 - 14x + 4.
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