The daily amount of water consumed by a species of plant is normally distributed with a mean of 250 ml and a standard deviation of 40 ml.
Find the daily water consumption value that is not exceeded by 95% of the plants. Give your answer to the nearest ml.
228 exam-style questions on CCEA A Level Maths 4.5.1 Statistical distributions (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.