Foundation Plus
16th March 1968
- 1Ratio2 marks
Red and blue stickers are in the ratio 5 : 7. There are 75 red stickers. How many stickers are there altogether?
- 2Angles in Polygons2 marks
A regular polygon has an exterior angle of 20°. How many sides does it have?
- 3Probability Trees3 marks
6 of 8 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
- 4Scatter Graphs3 marks
A line of best fit on a scatter graph has equation y = 5x + 35. Use it to estimate y when x = 11.
- 5Error Intervals2 marks
A number y is 22 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 March 1968, including the monthly compilation PDF.