handling data 1 (unit practice)

1. The pie chart shows the number of different phones in a class of students.

   a. How many Banana phones were there?

   b. What should the angle of the sector representing singsong phones be?

Answer explanation

8，60

2. Students in year 11 were asked whether they walk or cycle, or walk and cycle to school. The bar chart shows some of the results. All 203 year 11 students took part in the survey.

   How many both walk and cycle to school ?

Answer explanation

14

3. The table shows the numbers of gold, silver and bronze medals won by a team in two following years.

a. Draw a comparative bar chart to illustrate this data.

b. Comment on the difference between the two years.

Answer explanation

b Year 2 was much better, especially the number of gold medals won.

A fixed menu at a cafe offers two main course options followed by two dessert choices. One lunchtime there were 50 customers. The table shows some information about their choices.

Copy and complete the table.

Answer explanation

15, 8, 23

22, 5, 27

37, 13, 50

A soft drinks supplier produces a bar chart showing sales of their soft drinks and uses it to support the claim that sales of cola are more than twice the sales of the other drinks.

Give TWO REASONS why the diagram is misleading.

Answer explanation

(1) The blocks have different widths.

(2) The scale on the y-axis does not start at zero.

6. Find the mean, mode, and the median of 4, 5, 1, 7, 14, 9, 0, 6, 8.

Answer explanation

mean=6,

mode=none,

median=6

7. To obtain a grade A, Youseff's mean score in five tests must be 85 or more. Youseff has scored 86, 94, 75, and 88 in four tests.

8. What is his minimum mark in the fifth test to get a grade A?

Answer explanation

82

In a small town the mean number of burglaries per day during March was 2 while the mean number per day during April was 1.6.

What was the mean number per day during both months? Give your answer correct to 3 s.f.

Answer explanation

1.803...= 1.803 (3 s.f.)