#### Question 1

The stem-and-leaf plot displays the approximate percentage inflation rate for a number of countries, correct to one decimal place.

 2 8 9 3 1 4 4 7 4 2 4 5 5 7 9 5 0 1 1 4 5 7 9 6 2 3 5 6 6 7 2 4 2|8 means 2.8%

 a b c The number of countries included in the sample is: 6 26 32 The number of countries that have an inflation rate greater than 5.5% is: 9 10 11 A country is said to have an unstable economy if the inflation rate is higher than 6.4%. The number of countries in this sample that have a stable economy is: 20 21 25

#### Question 2

The weights of 41 male and 39 female students are compared in the back-to-back stem-and-leaf plot below. The weights are given correct to the nearest kilogram.

Females Males
9 8 3
9 8 8 7 7 7 7 6 6 4
9 8 7 7 7 5 4 1 1 0 0 0 5 2 8
5 4 4 4 0 0 0 0 6 1 1 1 3 3 4 4 5 5 5 7 7 8 9
5 2 1 0 0 7 0 0 1 2 3 3 5 5 7 8
1 0 0 8 0 0 1 2 3 3 5 5 7 8
9 0 7
10 0 0 9
 a b c The number of females who weigh more than 79 kg is: 2 3 5 The difference in weight between the heaviest and lightest males is: 48 kg 51 kg 57 kg The weight of the 21st heaviest female is: 57 58 59