Foundation Plus
4th November 1982
- 1Best Buy Questions3 marks
A pack of 11 pencils costs £5.50. A pack of 22 costs £10.56. Which pack is better value?
- 2Vectors2 marks
a is the column vector (-5, -2) and b is (7, 2). Work out a + b as a column vector.
- 3Probability Trees3 marks
3 of 10 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 = 9x + 11. Use it to estimate y when x = 4.
- 5Error Intervals2 marks
A number y is 27 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 November 1982, including the monthly compilation PDF.