Statistics / Grade 9

A set of drivers were asked about the number of accidents made in one year. Their answers were abbreviated in the following table:

The total number of surveyed drivers is:

• 20

• 70

• 4

• 10

A set of drivers were asked about the number of accidents made in one year. Their answers were abbreviated in the following table:

The number of drivers that made no accidents is:

• 0

• 3

• 5

• 7

A set of drivers were asked about the number of accidents made in one year. Their answers were abbreviated in the following table:

The percentage of drivers who made 4 accidents is:

• 4%

• 20%

• 25%

• 60%

A set of drivers were asked about the number of accidents made in one year. Their answers were abbreviated in the following table:

The mean (average) number of accidents is performed by a driver is:

• 1.5

• 2

• 2.5

• 1

Knowing that the total of a certain surveyed population is 25. The central angle of a value whose frequency 5 is:

• $20\degree$

• $72\degree$

• $90\degree$

• $105\degree$

The five grades of a student over 20 are: 10 ; 12 ; 13 ; 16 and 19. The average grade is:

• 13

• 14

• 14.5

• 15

The statistical data can be represented by:

• Frequency bar graph

• Pie graph

• Increasing cumulative frequency polygon

• All choices

Choose all correct answers by referring to the following bar graph representing a statistical series:

• The total frequency is 45

• The total frequency is 25

• The value 6 is the most frequent value

• The % relative frequency for the value 7 is 20%

• The % relative frequency for the value 7 is 24%

The adjacent graphic represents the cumulative frequency polygon of the students' grades in a certain class.

What is the number of the students of this class?

(a)  

The adjacent graphic represents the cumulative frequency polygon of the students' grades in a certain class.

How many students got a grade 8?

(a)