# Exam-Style Questions.

## Problems adapted from questions set for previous Mathematics exams.

### 1.

GCSE Higher

A survey is carried out by asking people questions as they come out of a coffee bar.

A section of the questionnaire is shown below.

Put a tick ☑ into the box in front of your chosen answer.

1. How often do you visit a coffee bar?

☐ Every day; ☐ Once or twice each week; ☐ Never.

☐ Female; ☐ Male.

3. What is your age group?

☐ Under 10; ☐ 10-20; ☐ 20-30; ☐ 31-40.

(a) Explain why this is a biased survey.

(b) State two criticisms of the questions or the options given for answers.

### 2.

GCSE Higher

Jimmy is ordering the t-shirts for the community choir which has 240 members.

He asks a sample of 36 members what colour the t-shirts should be. Each members chooses one colour.

The table shows information about his results.

Colour Number of members
Blue 6
Red 3
Green 7
Yellow 5
Purple 2
Black 6
White 7

(a) Work out how many of the 240 members you think will want black t-shirts.

### 3.

GCSE Higher

Donna is in a class of 25 students, 5 of whom have a pet dog.

There are 2200 students in the school.

(a) Use this information to estimate how many students in the school have pet dogs.

(b) Luka is at a different school.

She is in a class of 28 students, 7 of whom have pet dogs.

Luka and Donna have an idea. They think "In our two classes there are 53 students, 12 of whom have a pet dog. We can use this bigger sample to improve the estimate for Donna's school."

(c) Use this idea to estimate how many students in Donna's school have pet dogs.

### 4.

GCSE Higher

Poppy Pringle recorded the heights in centimetres of the sunflowers growing in her brother's and sister's gardens.

Here are the heights of the 19 sunflowers in her brother's garden:

$$94, 103, 110, 111, 123, 143, 150, 150, 151, 156, 157, 160, 170, 182, 201, 220, 250, 255, 231$$

 Median Lower quartile Upper quartile Shortest Tallest

Here is some information about the sunflowers in Poppy's sister's garden:

 Median 160 Lower quartile 143 Upper quartile 172 Shortest 110 Tallest 199

Poppy says that the sunflowers in her brother's garden are shorter that those in her sister's garden.

(b) Is Poppy correct?

Poppy says that the sunflowers in her brother's garden vary more in height than those in her sister's garden.

(c) Is Poppy correct?

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