Higher
1st April 1978
- 1Conditional Probability3 marks
17 students study Spanish and 11 of those also study Art. One Spanish student is picked at random. Work out the probability they study Art.
- 2Box Plots2 marks
A box plot has minimum 8, lower quartile 10, median 18, upper quartile 25 and maximum 31. Work out the interquartile range.
- 3Recurring Decimals to Fractions3 marks
Write the recurring decimal 0.444... as a fraction in its simplest form.
- 4Quadratic Formula3 marks
Use the quadratic formula to solve 4x^2 + 10x + 3 = 0, to 2 decimal places.
- 5Direct and Inverse Proportion Depth3 marks
y is directly proportional to x^2. When x = 5, y = 175. Work out y when x = 8.
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Any date always gives the same five questions, so a sheet can be set again or shared. All of April 1978, including the monthly compilation PDF.