Seven families live on a small street in a certain town. Their annual incomes (in $1000s) are 15, 20, 30, 35, 50, 60, and 150.

a. Find the first and third quartiles, and the IQR.

b. Show that 150 is an outlier.

A big new house is built on the street, and the income (in $1000s) of the family that moves in is 200.

c. Find the first and third quartiles, and the IQR of the eight incomes.

d. Are there any outliers now?

e. Explain how adding the value 200 to the data set eliminated the outliers.