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 2, lower quartile 10, median 16, upper quartile 21 and maximum 27. Work out the interquartile range.

Write √45 in the form a √b, where b is as small as possible.Write sqrt(45) in the form a sqrt(b), where b is as small as possible.

A line has gradient 4 and passes through (6, 16). Work out its equation.

y is directly proportional to x². When x = 5, y = 150. Work out y when x = 3.y is directly proportional to x^2. When x = 5, y = 150. Work out y when x = 3.