Daily Practice - Higher

3 of 7 bulbs in a box are faulty. Two are taken with replacement. Work out the probability at least one is faulty.

A box plot has minimum 7, lower quartile 10, median 19, upper quartile 28 and maximum 31. Work out the interquartile range.

Work out (48 x 10⁸) / (8 x 10²). Give your answer in standard form.Work out (48 x 10^8) / (8 x 10^2). Give your answer in standard form.

The curve y = 3^x is drawn. Work out y when x = 1, and write down where the curve crosses the y-axis.The curve y = 3^x is drawn. Work out y when x = 1, and write down where the curve crosses the y-axis.

y is directly proportional to x². When x = 4, y = 112. Work out y when x = 5.y is directly proportional to x^2. When x = 4, y = 112. Work out y when x = 5.