Mathematics (AS & A Level) · May / June 2016 · Paper 73 · Question 1
9709
As printed in the paper
The question as text
The time taken for a particular type of paint to dry was measured for a sample of 150 randomly chosen points on a wall. The sample mean was 192.4 minutes and an unbiased estimate of the population variance was 43.6 minutes2. Find a 98% confidence interval for the mean drying time. [3]
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.