Mathematics (AS & A Level) · Feb / March 2020 · Paper 62 · Question 3
9709
As printed in the paper
The question as text
In the past, the mean time taken by Freda for a particular daily journey was 39.2 minutes. Following the introduction of a one-way system, Freda wishes to test whether the mean time for the journey has decreased. She notes the times, t minutes, for 40 randomly chosen journeys and summarises the results as follows. n = 40 Σt = 1504 Σt2 = 57 760
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
3(a)[3]
3(b)[5]
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.