Foundation Plus
20th November 1979
- 1Writing and Simplifying Ratio2 marks
Write the ratio 7 : 56 in the form 1 : n.
- 2Vectors2 marks
a is the column vector (0, -3) and b is (-7, -5). Work out a + b as a column vector.
- 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.
- 4Averages from Frequency Tables2 marks
Grouped data has five classes of width 5, the first being 10 < x <= 15. The frequencies in order are 16, 11, 7, 3, 21. Write down the modal class.
- 5Error Intervals2 marks
A number y is 13 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 1979, including the monthly compilation PDF.