Higher
25th January 1978
- 1Probability Trees3 marks
5 of 7 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.
- 2Cumulative Frequency2 marks
Four classes in order have frequencies 7, 5, 12, 10. Write down the cumulative frequency at the end of the third class.
- 3Recurring Decimals to Fractions3 marks
Write the recurring decimal 0.222... as a fraction in its simplest form.
- 4Trigonometric and Exponential Graphs2 marks
The curve y = 2^x is drawn. Work out y when x = 5, and write down where the curve crosses the y-axis.
- 5Speed and Density2 marks
A block has volume 175 cm^3 and density 11 g/cm^3. Work out its mass.
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Any date always gives the same five questions, so a sheet can be set again or shared. All of January 1978, including the monthly compilation PDF.