Estimating Measures of Central Tendency

In order to find the ____________, we add up all of the numbers in the data set and then divide the sum by the number of numbers.

• Average

• Mode

• Upper Quartile

• Median

The ____________ is the measure of central tendency that represents the middle number in a set of data.

• Mode

• Average

• Principal

• Median

The number that appears the most in a data set is commonly known as the ___________.

• Mean

• Range

• Mode

• Average

The median of the top 50% of the number values in the data set is known as the _________________.

• Upper Extreme

• Principal

• Upper Quartile

• Range

Match the following vocabulary with the definitions

• Mean

• the average of values, sum of all values divided by how many values

• Median

• the difference between the largest and smallest values in a data set

• Mode

• the middle value, when the data is ordered from least to greatest

• Range

• the most frequently occurring value(s)

What is the MEDIAN of this data

Mathematical Equivalence

ON

What is the median of the following numbers? 1, 2, 2, 8, 9, 20

• 19

• Mean

• 20

• Median

• 5

• Mode

• 7

• Outlier

• 2

• Range

How do we find the median when there are exactly TWO numbers in the middle of the data set?

• We add up all of the numbers and divide by the number of numbers.

• Subtract the lower extreme from the upper extreme.

• Add the two numbers together and divide the sum by 2.

• Use the formula I = P x r x t

The following data set represents the responses from students when they were asked how many siblings they had: 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 4, 7 What is the average number of siblings for this set of students?

• About 2.6

• 6

• About 18

• About 2.4

Tags

CCSS.4.MD.B.4

Measures of Central Tendency help us to relate numbers in a set of data to each other. For example, if the average student’s grade in your math class is an 81, we know that someone who has a grade of 97 is performing well ABOVE the average in that class. Amongst the following choices, which grade would represent a student performance that is considered well BELOW average?

• 80

• 75

• 77

• 62