Daily Practice - Higher Plus
Grades 8-9 - exam-stretch algebra, geometry and reasoning.
22nd June 2007
- 1Conditional Probability3 marks
A bag holds 5 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 10 < x <= 30 has a frequency density of 2.4. How many values are in that class?
- 3Surds3 marks
Rationalise the denominator of 20/sqrt(5), giving your answer in its simplest form.
- 4Proof2 marks
In an algebraic proof, how would you write two consecutive odd numbers in terms of an integer n?
- 5Velocity Time Graphs2 marks
A train slows steadily from 26 m/s to rest in 5 seconds. Work out its deceleration.
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