Daily Practice - Higher

4 of 6 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 9, lower quartile 16, median 18, upper quartile 26 and maximum 34. Work out the interquartile range.

Write 72 in the form a b, where b is as small as possible.Write sqrt(72) in the form a sqrt(b), where b is as small as possible.

The curve y = 5^x is drawn. Work out y when x = 1, and write down where the curve crosses the y-axis.The curve y = 5^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 = 5, y = 225. Work out y when x = 3.y is directly proportional to x^2. When x = 5, y = 225. Work out y when x = 3.