.STATISTICS

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?

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

How many students got a grade 8?

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%

Mode is

• Least frequent value

• Middle most value

• Most frequent value

• None of these

The abscissa of the point of intersection of less than type and more than type cumulative frequency curves of a grouped data gives its

• Mean

• Median

• Mode

• Class

Find the median of the following values

37,31,42,43,46,25,39,45 and 32

• 46

• 43

• 39

• 25

The class mark of the class 5.5-20.5 is

• 15.5

• 20.5

• 18

• 5

Find the mean of all the factors of 10

• 4

• 4.5

• 3.5

• 2.5

The mean of 8 numbers is 15 if each number is multiplied by 2 what will be the new mean?

• Remains unchanged

• 30

• 17

• 16

What is the difference between the highest score and the lowest score on the test?

• 15
• 100
• 6
• 10