Daily Practice - Higher Plus
Grades 8-9 - exam-stretch algebra, geometry and reasoning.
6th October 2021
- 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 30 < x <= 40 has a frequency density of 3.5. How many values are in that class?
- 3Bounds3 marks
A rectangle is 26 cm by 17 cm, each correct to the nearest cm. Work out the upper bound of its area.
- 4Factorising Harder Quadratics3 marks
Solve 16x^2 - 16x - 5 = 0.
- 5Direct and Inverse Proportion Depth3 marks
y is directly proportional to x^3. When x = 3, y = 162. Work out y when x = 5.
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