Higher Plus
2nd April 1972
- 1Conditional Probability3 marks
A bag holds 4 red, 6 blue and 6 green counters. Two are taken without replacement. Given neither is green, what is the probability both are red?
- 2Histograms3 marks
On a histogram the bar for 30 < x <= 40 has a frequency density of 1.5. How many values are in that class?
- 3Bounds3 marks
x = 114 and y = 95, 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 - 6x + 1.
- 5Velocity Time Graphs2 marks
A train slows steadily from 31 m/s to rest in 8 seconds. Work out its deceleration.
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