Foundation Plus
16th September 1978
- 1Probability Trees3 marks
A bag holds 3 red and 4 blue counters. One is taken, replaced, then another is taken. Work out the probability both are red.
- 2Box Plots2 marks
A box plot has minimum 12, lower quartile 22, median 32, upper quartile 34 and maximum 40. Work out the interquartile range.
- 3Prime Factors, HCF and LCM3 marks
Write 72 as a product of its prime factors, using index form.
- 4Drawing Other Graphs: Cubic/Reciprocal2 marks
For the curve y = 30/x, work out y when x = -5, and write down the equation of its vertical asymptote.
- 5Direct and Inverse Proportion3 marks
y is directly proportional to x. When x = 7, y = 28. Work out y when x = 3.
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