18B Taking it FURTHER


1. The line plot on the right represents laptop sales for a certain shop in a given week.


(i) How many laptops were sold on Monday? (ii) On which day did the shop sell the fewest laptops? (iii) Which was the most popular day for sales? (iv) How many laptops were sold over the weekend? (v)


Laptop sales = 4


Days of the week If a customer is picked at random, what is the probability that they bought a laptop on Friday?


2. (i) Find the most popular breakfast from the data shown in the bar chart on the right.


(ii) If 70 more people vote for eggs, what would be the most popular breakfast?


(iii) How many people voted for toast as their favourite breakfast? (iv) Find the difference between highest and lowest frequency?


3. The directors of a company want to introduce changes to employee work rotas. The directors want to find out what the employees think about the proposed changes. They decide to collect the information by using one of two data collection methods.


● Method 1: each employee will be interviewed by one of the directors. ● Method 2: each employee will complete a questionnaire without filling in their name.


There are 100 employees in the company. (i) List the advantages and disadvantages of each data collection method.


(ii) Which method would you advise the directors to use? Justify your answer using the advantages and disadvantages of the data collection methods.


4. Mark wants to find out the types of film people like best. (i) Write a question that Mark could ask to find out this information. (ii) Design a suitable table for a data collection sheet he could use to collect this information.


(iii) Mark collects his data by asking 10 students in his class at school. Is this a good data collection method? Give reasons for your answer.


5. Jim conducts a survey about eye colour and represents the data on a histogram. (i) Is this an appropriate way to represent this data? Justify your answer. (ii) What kind of chart could he have used? Justify your answer.


120 100 80 60 40 20 0


Breakfast Favourite breakfast


Now that you have completed the unit, revisit the


Something to think about …


question posed at the start of this unit. [1BA23.69]


Now try question 12 on page 408


301


18 Collecting and representing data


Number of votes


Mon Tues Wed


Thurs Fri


Sat Sun


Pancakes Eggs


Toast Cereal


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