Mathematics (AS & A Level) · May / June 2019 · Paper 73 · Question 4

A factory supplies boxes of children’s bricks. Each box contains 10 randomly chosen large bricks and 20 randomly chosen small bricks. The masses, in grams, of large and small bricks have the distributions N60, 1.2 and N30, 0.7 respectively. The mass of an empty box is 8 g. Find the probability that the total weight of a box and its contents is less than 1200 g. [5]

Read automatically from the paper; the printed page above is exact.