Daily Practice

Higher

14th July 1981

5 questions · 13 marks · Grades 6-7 · 61 question types in this band

1
Conditional Probability3 marks
16 students study Spanish and 7 of those also study Art. One Spanish student is picked at random. Work out the probability they study Art.
2
Capture Recapture3 marks
25 beetles are marked and released. Later 99 are caught, of which 9 are marked. Estimate the population.
3
Surds2 marks
Write sqrt(72) in the form a sqrt(b), where b is as small as possible.
4
Quadratic Formula3 marks
Work out the discriminant of 2x^2 + 3x + 9 = 0 and say how many real solutions it has.
5
Writing a Ratio as a Fraction or Linear Function2 marks
x : y = 2 : 5. Write y in terms of x.

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