Mean Median Mode Iqr Outliers

If Q1 = 60 and Q3 = 77.5, use the formula for to find the Lower Fence.

• 33.75

• 17.5

• 26.25

• 40

If the Lower Fence is 33.75, and the Upper fence is 103.75, are there any outliers in this data set?

• Yes, 100 is an outlier

• Yes, 60 is an outlier

• No, there are no outliers.

Find the IQR of the following numbers:

84, 88, 72, 74, 98, 16, 94

• 78

• 22

• 16

• There is no IQR.

What measure of central tendency (mean, median or mode) would be best for the following set of data?
20, 89, 92, 97, 99, 100

• Mode, because it is the one that shows up the most.

• Median, because there is an outlier.  The outlier would influence the mean too much.

• Mean, because there is not an outlier.  You should always use the mean.

• There is not a best measure of central tendency for this data.

What measure of center is best to use when we have outliers?

• mean

• median

• mode

• range

The __________ of the data set is the sum of the data divided by the number of pieces of data.

• third quartile

• mean

• measures of center

• mode

Data Set: 44, 43, 42, 40, 42, 45, 39, 38, 18.

Is the median or mean the best measure of center? Explain.

Choose the correct measure of center AND explanation.

• Median, because there is an outlier

• Median, because the data is clustered together

• Mean, because there is an outlier

• Mean, because the data is clustered together

What is the Median

• Middle number (also known as Q2)

• the average

• the number that occurs the most

What do you do if there are two numbers in "the middle" when you are finding the median?

• Pick your favorite number

• Add the two numbers in the middle & then divide by two.

• They are both the median

• None of the above

Extremely high or low values in a data set are called __________ .

• outliers

• median

• mode

• first quartile