Daily Practice

Foundation Plus

25th November 1978

5 questions · 12 marks · Grades 4-6 · 128 question types in this band

1
Ratio2 marks
Red and blue marbles are in the ratio 5 : 6. There are 15 red marbles. How many marbles are there altogether?
2
Vectors2 marks
a is the column vector (3, 8) and b is (7, 6). Work out a + b as a column vector.
3
Probability Trees3 marks
4 of 8 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
4
Capture Recapture3 marks
25 beetles are marked and released. Later 30 are caught, of which 6 are marked. Estimate the population.
5
Error Intervals2 marks
A number y is 88 when truncated to the nearest whole number. Write down the error interval for y.

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