Daily Practice

Foundation Plus

22nd March 1984

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

1
Best Buy Questions3 marks
A pack of 7 sponges costs £1.05. A pack of 21 costs £1.89. Which pack is better value?
2
Vectors2 marks
a is the column vector (8, 6) and b is (-6, -5). Work out a + b as a column vector.
3
Probability Trees3 marks
3 of 5 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
4
Averages from Frequency Tables2 marks
Grouped data has five classes of width 10, the first being 30 < x <= 40. The frequencies in order are 7, 21, 3, 16, 11. Write down the modal class.
5
Error Intervals2 marks
A number y is 18 when truncated to the nearest whole number. Write down the error interval for y.

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