Daily Practice - Higher

3 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 4, lower quartile 14, median 22, upper quartile 28 and maximum 36. Work out the interquartile range.

Write √50 in the form a √b, where b is as small as possible.Write sqrt(50) 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 = 2, and write down where the curve crosses the y-axis.The curve y = 5^x is drawn. Work out y when x = 2, 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 = 8.y is directly proportional to x^2. When x = 3, y = 72. Work out y when x = 8.