Daily Practice - Higher

5 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 16, median 19, upper quartile 22 and maximum 30. Work out the interquartile range.

Write the recurring decimal 0.4949... as a fraction in its simplest form.

The curve y = 2^x is drawn. Work out y when x = 1, and write down where the curve crosses the y-axis.The curve y = 2^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 = 3, y = 72. Work out y when x = 4.y is directly proportional to x^2. When x = 3, y = 72. Work out y when x = 4.