Higher Plus
28th July 1968
- 1Probability Equation Questions3 marks
A bag holds 11 counters, r of them red. Two are taken without replacement and P(both red) = 21/55. Work out r.
- 2Histograms3 marks
On a histogram the bar for 40 < x <= 60 has a frequency density of 0.4. How many values are in that class?
- 3Bounds3 marks
x = 168 and y = 112, each correct to the nearest whole number. Work out the upper bound of x - y.
- 4The Nth Term of a Quadratic Sequence2 marks
A quadratic sequence starts 9, 27, 55, 93. Work out the second difference, and the coefficient of n^2.
- 5Velocity Time Graphs2 marks
A train slows steadily from 31 m/s to rest in 5 seconds. Work out its deceleration.
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Any date always gives the same five questions, so a sheet can be set again or shared. All of July 1968, including the monthly compilation PDF.