Grouped Frequency Table

How many classes are there in this table?

• 51

• 4

• 10

• 2

Which is the 1st class?

• 140 ≤ h < 150

• 150 ≤ h < 160

• 160 ≤ h < 170

• 170 ≤ h < 180

Which is the modal class?

• 140 ≤ h < 150

• 150 ≤ h < 160

• 160 ≤ h < 170

• 170 ≤ h < 180

Which is the modal class?

• 140 ≤ h < 150

• 150 ≤ h < 160

• 160 ≤ h < 170

• 170 ≤ h < 180

What is each class width?

• 140 – 180

• 51

• 6 – 21

• 10

To estimate the mean, we should use

• each class' lower bound

• each class' upper bound

• each class

• each class' middle value

Why can we only estimate the mean for this given data?

• There's no need being precise

• We don't have the raw data

• Mr Chang is lazy

• We may have counted the students incorrectly

For this data, how many data points are there?

• 4 children

• 51 children

• 180 cm

• 140 cm

For the median, the middle child would be:

• 25th in line

• 26th in line

• 160cm tall

• the forgotten child

Estimate the mean height of these 123 students (using your calculator)

• 166cm

• 167cm

• 168cm

• 169cm