Higher
5th August 1978
- 1Probability Trees3 marks
3 of 9 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
- 2Box Plots2 marks
A box plot has minimum 8, lower quartile 15, median 23, upper quartile 28 and maximum 36. Work out the interquartile range.
- 3Standard Form3 marks
Work out (16 x 10^6) / (2 x 10^3). Give your answer in standard form.
- 4Trigonometric and Exponential Graphs2 marks
The curve y = 6^x is drawn. Work out y when x = 2, and write down where the curve crosses the y-axis.
- 5Direct and Inverse Proportion Depth3 marks
y is directly proportional to x^2. When x = 5, y = 75. Work out y when x = 4.
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