Daily Practice

Foundation Plus

14th July 1983

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

1
Best Buy Questions3 marks
A pack of 10 pencils costs £3.50. A pack of 30 costs £9.60. Which pack is better value?
2
Vectors2 marks
a is the column vector (-7, 1) and b is (-5, 0). Work out a + b as a column vector.
3
Probability Trees3 marks
4 of 7 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
4
Averages from Frequency Tables3 marks
In a survey 6 households own 1 car, 4 own 2 cars and 9 own 3 cars. Work out the mean number of cars, to 2 decimal places.
5
Error Intervals2 marks
A number y is 37 when truncated to the nearest whole number. Write down the error interval for y.

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