Statistics Unit Review 2

Which of the following is discrete, numerical data?

• Heights of students in a class

• Number of years of piano lessons

• Hair colours of a Year 9 class

• Grades obtained in an English examination

• Prices for 4 different sizes of pizza at various restaurants

The mean and the mode of the data set shown below is:

• 10 and 10 respectively

• 8 and 10 respectively

• 8.5 and 10 respectively

• 10 and 11 respectively

• Cannot be determined from the given information

The following are the number of text messages some students send to each other on a daily basis. The median score is: 28, 24, 30, 28, 26, 15, 21, 19, 30, 28, 31

• 26

• 28

• 27.5

• 29

• 30

The class average in a Mathematics test is 72.4. If there are 20 students in the class and the total score of the top 19 students was 1440, the lowest score in the class was:

• 8

• 18

• 36

• 37

• Cannot be determined from the given information.

A data set has 120 scores and a mean score of 65.3. What is the total of the 120 scores?

• 653

• 6530

• 7836

• 78 360

• None of the above

If 18 is added to the data set below, which of the following statements is true?

• The mode increases.

• The mean decreases.

• The median increases.

• The range increases.

• The mean increases.

For a certain data set the maximum value is 98 and the range is 63. What is the minimum value?

• 35

• 36

• 37

• 38

For a certain data set the minimum value is 98 and the range is 63. What is the maximum value?

• 160

• 161

• 162

• 163

Jane needed an average score of 92 on five tests to obtain an A. The mean of her first four scores was 90. What is the lowest mark that she can obtain on her fifth test in order to obtain an A?

• 92

• 94

• 100

• 98

How many members are in the running club?

• 50

• 74

• 70

• 82