Andrew entered a swimming race.
The times in this race are normally distributed with a mean time of 57 seconds and a standard deviation of 8 seconds.
Andrew swam the race in a time of 70 seconds.
Calculate the standardised score for Andrew.
Ravina swam in the same race.
Her standardised score is 1.8.
Which of Andrew or Ravina did better in the race?
Give a reason for your answer.
6 exam-style questions on Edexcel GCSE Statistics Standardised Scores. Each one has a worked solution and a mark scheme showing where the marks go.