Estimating Mean Average from Grouped Frequency Table

Estimating Mean Average from Grouped Frequency Table

How to work out the estimated mean from data grouped in a table

To estimate the mean from grouped frequency table we have to ....

• Look at the groupings and identify the midpoint. For example, if the grouping is 1-10 the midpoint will be 5.5 (1 + 10 = 11, 11 divided by 2 is 5.5)

• Then multiply the Midpoint by the Frequency

• Then Divide the Total of the Midpoint x Frequency, by the Frequency total

Multiple Choice

Calculate mean for the above given data.

• 1.6

• 1.4

• 1.3

• 1.8

Multiple Choice

• 5.45

• 5.565

• 5.645

• 5.85

Multiple Choice

Find the mean.

• 10

• 20

• 30

• 40

Multiple Choice

Find the estimated mean from the following table...

You may need to copy the table out and add columns...

• 28.5

• 31.5

• 30.5

• 29.5

Multiple Choice

• 53.75

• 54.375

• 55.575

• 56.45