Higher Plus
7th December 1975
- 1Conditional Probability3 marks
A bag holds 6 red and 4 blue counters. Two are taken without replacement. Given the first was red, what is the probability the second is blue?
- 2Histograms3 marks
On a histogram the bar for 50 < x <= 60 has a frequency density of 3.5. How many values are in that class?
- 3Bounds3 marks
x = 37 and y = 5, each correct to the nearest whole number. Work out the upper bound of x - y.
- 4Rearranging Harder Formulae3 marks
Make x the subject of 5x + 7 = y(x + 7).
- 5Velocity Time Graphs2 marks
A train slows steadily from 17 m/s to rest in 4 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 December 1975, including the monthly compilation PDF.