Daily Practice

Foundation Plus

28th September 1989

5 questions · 13 marks · Grades 4-6 · 128 question types in this band

1
Best Buy Questions3 marks
A pack of 7 batteries costs £1.05. A pack of 21 costs £2.10. Which pack is better value?
2
Vectors2 marks
a is the column vector (8, 7) and b is (-2, 2). Work out a + b as a column vector.
3
Probability Trees3 marks
1 of 5 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
4
Capture Recapture3 marks
45 beetles are marked and released. Later 54 are caught, of which 9 are marked. Estimate the population.
5
Error Intervals2 marks
A number y is 5 when truncated to the nearest whole number. Write down the error interval for y.

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