Higher Plus

A bag holds 5 red, 3 blue and 2 green counters. Two are taken without replacement. Given neither is green, what is the probability both are red?

A histogram has four 10-wide classes from 0, with frequency densities 3, 0.5, 2, 1. Which class contains the median?

A block has mass 590 g (to the nearest 10 g) and volume 13 cm³ (to the nearest cm³). Work out the upper bound of its density, to 2 decimal places.A block has mass 590 g (to the nearest 10 g) and volume 13 cm^3 (to the nearest cm^3). Work out the upper bound of its density, to 2 decimal places.

The curve y = cos x° is drawn for 0 ≤ x ≤ 360. Write down the value of y when x = 90.The curve y = cos x° is drawn for 0 <= x <= 360. Write down the value of y when x = 90.

y is directly proportional to x. When x = 25, y = 30. Work out y when x = 16.y is directly proportional to sqrt(x). When x = 25, y = 30. Work out y when x = 16.