Daily Practice - Higher
Grades 6-7 - Higher-tier method and manipulation.
5th November 2005
- 1Conditional Probability3 marks
22 students study Spanish and 6 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 6, lower quartile 13, median 23, upper quartile 30 and maximum 32. Work out the interquartile range.
- 3Reverse Percentages3 marks
A bill is £960 including VAT at 20%. Work out the amount before VAT.
- 4Quadratic Formula3 marks
Work out the discriminant of 3x^2 - 3x + 3 = 0 and say how many real solutions it has.
- 5Direct and Inverse Proportion Depth3 marks
y is directly proportional to x^2. When x = 5, y = 225. Work out y when x = 7.
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