Daily Practice - Higher

1 of 10 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 6, median 9, upper quartile 15 and maximum 21. Work out the interquartile range.

Write √27 in the form a √b, where b is as small as possible.Write sqrt(27) 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 = 4, and write down where the curve crosses the y-axis.The curve y = 5^x is drawn. Work out y when x = 4, 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 = 3.y is directly proportional to x^2. When x = 4, y = 112. Work out y when x = 3.