Daily Practice
Higher
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20th April 1987
- 1Probability Trees3 marks
2 of 8 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
- 2Cumulative Frequency2 marks
A cumulative frequency graph is drawn for 216 values. What cumulative frequency do you read across from to estimate the lower quartile?
- 3Fractional and Negative Indices3 marks
Work out 49^(3/2).
- 4Equation of a Line3 marks
A line has gradient 5 and passes through (6, 24). Work out its equation.
- 5Repeated Percentage Change3 marks
A price rises by 20% and then falls by 15%. Work out the overall percentage change, to 2 decimal places.
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Any date always gives the same five questions, so a sheet can be set again or shared. All of April 1987, including the monthly compilation PDF.