Daily Practice

Higher Plus

11th December 1981

5 questions · 15 marks · Grades 8-9 · 51 question types in this band

1
Conditional Probability3 marks
A bag holds 3 red, 7 blue and 6 green counters. Two are taken without replacement. Given neither is green, what is the probability both are red?
2
Histograms3 marks
On a histogram the bar for 10 < x <= 30 has a frequency density of 3.5. How many values are in that class?
3
Surds3 marks
Rationalise the denominator of 30/sqrt(5), giving your answer in its simplest form.
4
Inverse and Composite Functions3 marks
f(x) = 5x + 4 and g(x) = 3x + 2. Work out fg(-1).
5
Direct and Inverse Proportion Depth3 marks
y is directly proportional to x^3. When x = 2, y = 48. Work out y when x = 4.

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