Daily Practice

Foundation Plus

24th April 1971

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

1
Ratio2 marks
Red and blue stickers are in the ratio 4 : 5. There are 20 red stickers. How many stickers are there altogether?
2
Vectors2 marks
a is the column vector (-7, -2) and b is (-7, -4). Work out a + b as a column vector.
3
Probability Trees3 marks
2 of 7 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
4
Capture Recapture3 marks
15 beetles are marked and released. Later 42 are caught, of which 7 are marked. Estimate the population.
5
Error Intervals2 marks
A number y is 87 when truncated to the nearest whole number. Write down the error interval for y.

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