Foundation Plus
15th September 1964
- 1Writing and Simplifying Ratio2 marks
Write the ratio 4 : 8 in the form 1 : n.
- 2Vectors2 marks
a is the column vector (-8, -5) and b is (4, -3). Work out a + b as a column vector.
- 3Probability Trees3 marks
2 of 9 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 20 < x <= 30. The frequencies in order are 7, 11, 3, 16, 21. Write down the modal class.
- 5Error Intervals2 marks
A number y is 45 when truncated to the nearest whole number. Write down the error interval for y.
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