Daily Practice - Higher Plus

A bag holds 9 red and 5 blue counters. Two are taken without replacement. Given the first was red, what is the probability the second is blue?

A histogram has four 20-wide classes from 0, with frequency densities 2, 1, 3, 0.5. Which class contains the median?

A block has mass 820 g (to the nearest 10 g) and volume 9 cm³ (to the nearest cm³). Work out the upper bound of its density, to 2 decimal places.A block has mass 820 g (to the nearest 10 g) and volume 9 cm^3 (to the nearest cm^3). Work out the upper bound of its density, to 2 decimal places.

In an algebraic proof, how would you write an odd number in terms of an integer n?

y is directly proportional to √x. When x = 9, y = 12. Work out y when x = 49.y is directly proportional to sqrt(x). When x = 9, y = 12. Work out y when x = 49.