Interactive practice questions
Find the population standard deviation of the following set of scores, to two decimal places, by using the statistics mode on the calculator:
$8,20,9,9,8,19,9,18,5,10$8,20,9,9,8,19,9,18,5,10
Find the population standard deviation of the following set of scores correct to two decimal places by using the statistics mode on the calculator:
$-17,2,-6,9,-17,-9,3,8,5$−17,2,−6,9,−17,−9,3,8,5
Given the following data arranged in the stem and leaf plot:
The mean income of people in Country A is $\$19069$$19069. This is the same as the mean income of people in Country B. The standard deviation of Country A is greater than the standard deviation of Country B. In which country is there likely to be the greatest difference between the incomes of the rich and poor?