Foundation Plus
12th December 1985
- 1Best Buy Questions3 marks
A pack of 5 sponges costs £2.50. A pack of 20 costs £8.80. Which pack is better value?
- 2Angles in Polygons2 marks
A regular polygon has an exterior angle of 36°. How many sides does it have?
- 3Probability Trees3 marks
2 of 6 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
- 4Capture Recapture3 marks
25 voles are marked and released. Later 6 are caught, of which 2 are marked. Estimate the population.
- 5Error Intervals2 marks
A number y is 83 when truncated to the nearest whole number. Write down the error interval for y.
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Any date always gives the same five questions, so a sheet can be set again or shared. All of December 1985, including the monthly compilation PDF.