Daily Practice

Foundation Plus

28th April 1977

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

1
Best Buy Questions3 marks
A pack of 7 batteries costs £2.45. A pack of 21 costs £6.72. Which pack is better value?
2
Vectors2 marks
a is the column vector (5, 1) and b is (7, -8). Work out a + b as a column vector.
3
Probability Trees3 marks
1 of 9 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
4
Box Plots2 marks
A box plot has minimum 10, lower quartile 16, median 23, upper quartile 30 and maximum 37. Work out the interquartile range.
5
Error Intervals2 marks
A number y is 28 when truncated to the nearest whole number. Write down the error interval for y.

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