Higher
14th October 1968
- 1Conditional Probability3 marks
18 students study Spanish and 5 of those also study Art. One Spanish student is picked at random. Work out the probability they study Art.
- 2Cumulative Frequency2 marks
A cumulative frequency graph is drawn for 76 values. What cumulative frequency do you read across from to estimate the lower quartile?
- 3Recurring Decimals to Fractions3 marks
Write the recurring decimal 0.8585... as a fraction in its simplest form.
- 4Quadratic Formula3 marks
Work out the discriminant of 3x^2 - 8x + 6 = 0 and say how many real solutions it has.
- 5Repeated Percentage Change3 marks
A price rises by 20% and then falls by 20%. 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 October 1968, including the monthly compilation PDF.