Daily Practice - Foundation Plus
24th October 1991
- 1Best Buy Questions3 marks
A pack of 8 pencils costs £3.20. A pack of 16 costs £5.60. Which pack is better value?
- 2Vectors2 marks
a is the column vector (-2, -5) and b is (-6, 6). Work out a + b as a column vector.
- 3Probability 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.
- 4Averages from Frequency Tables2 marks
Grouped data has five classes of width 10, the first being 0 < x <= 10. The frequencies in order are 21, 7, 11, 16, 3. Write down the modal class.
- 5Error Intervals2 marks
A number y is 69 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 October 1991, including the monthly compilation PDF.