Higher Plus
10th February 1961
- 1Proof of the Circle Theorems2 marks
In a circle theorem proof, a step uses the fact that opposite angles of a cyclic quadrilateral are being proved. 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) = 1/3. Work out r.
- 3Histograms3 marks
A histogram has two bars: one 20 units wide with frequency density 1.2, one 5 units wide with density 1.4. How many values in total?
- 4Surds3 marks
Rationalise the denominator of 121/sqrt(11), giving your answer in its simplest form.
- 5Completing the Square3 marks
Write x^2 - 12x + 11 in the form (x + a)^2 + b.
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