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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 The number of countries included in the sample is:
6 26 32 check answer for question 1a.
b The number of countries that have an inflation rate greater than 5.5% is:
9 10 11 check answer for question 1b.
c 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 check answer for question 1c.

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 The number of females who weigh more than 79 kg is:
check answer for question 2a.
b The difference in weight between the heaviest and lightest males is:
check answer for question 2b.
c The weight of the 21st heaviest female is:
check answer for question 2c.