Daily Practice

Higher

18th September 1981

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

1
Probability Trees3 marks
1 of 10 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
2
Capture Recapture2 marks
A capture-recapture estimate is made of the moth population of a meadow. State one assumption the method relies on.
3
Surds2 marks
Write sqrt(18) in the form a sqrt(b), where b is as small as possible.
4
Factorising Harder Quadratics3 marks
Factorise 16x^2 + 32x + 15.
5
Direct and Inverse Proportion3 marks
y is directly proportional to x. When x = 8, y = 24. Work out y when x = 14.

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