11.05 Comparisons using standard deviation
Interactive practice questions
The mean income of people in Canada is $\$43000$$43000. This is the same as the mean income of people in Germany. The standard deviation of Canada is greater than the standard deviation of Germany. In which country is there likely to be the greatest difference between the incomes of the rich and poor?
Canada
Germany
Two cricketers compare the mean and standard deviation of their runs made per match.
They conclude that Ivan is a more consistent batter but Bianca generally scores more runs per match.
Two companies record the wait time for calls to their customer hotlines over $10$10 calls. The recorded values are given below in minutes.
The life of two brands of batteries are tested using a sample of $10$10 batteries from each brand. Their battery lives (in hours) are shown below.