Daily Practice - Higher
Grades 6-7 - Higher-tier method and manipulation.
17th July 2009
- 1Probability Trees3 marks
1 of 7 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
- 2Capture Recapture2 marks
A capture-recapture estimate is made of the moth population of a meadow. State one assumption the method relies on.
- 3Surds2 marks
Write sqrt(75) in the form a sqrt(b), where b is as small as possible.
- 4Simultaneous Equations3 marks
5 teas and 2 cakes cost £10.30. 1 tea and 5 cakes cost £8.50. Find the price of a tea.
- 5Direct and Inverse Proportion3 marks
y is directly proportional to x. When x = 5, y = 15. Work out y when x = 11.
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