quiz 1 : measures of dispersion

State the midpoint of the class interval (3.8 – 5.2).

• 3.8

• 4.5

• 4.6

• 5.2

Calculate the size of the class intervals below.

• 12

• 12.5

• 13

• 13.5

Determine the value of x in the cumulative frequency table below.

• 10

• 11

• 12

• 13

The diagram below shows a box plot. Determine the interquartile range.

• 10

• 15

• 20

• 25

Determine the range of the following distribution.

• RM40

• RM44.50

• RM54.50

• RM60

Calculate the standard deviation for the following data.

• 2.928

• 4.848

• 5.148

• 6.227

The table below shows some statistical measures of the goals scored by four basketball teams within a year. Among the teams A, B, C and D, which team is the least consistent?

• A

• B

• C

• D

The cumulative frequency table shows the distribution of mass of letters in a post box.

if the mod class is 20 - 29, determine a possible value of y

• 5

• 6

• 7

• 8

The Diagram is a histogram showing the mass of 36 children.

Calculate the mean in kg, of a child

• 24.5

• 27.0

• 29.5

• 32.0

Identify the distribution of the data.

• Right-skewed

• Left-skewed

• Symmetric