(6) Kaitlin asked12 students how many courses they have taken so far at her college. Here is the list of answers.

14,3,22,10,3,5,23,18,16,9,1, 26

What is the percentage of these students who have taken fewer than11 courses?

(7) The following are the annual salaries of16

chief executive officers of major companies. (The salaries are written in thousands of dollars.)

562,790,271,315,767,338,75,743,84,224,542,1250,633,134,248,157

Send data to calculator

Find25th and70thpercentiles for these salaries.

(a)The25th percentile: ( ) thousand dollars.

(b)The70th percentile: ( ) thousand dollars.

(9) Here are the scores of13 students on an algebra test.

55,56,62,62,71,72,74,75,79,80,84,88,90

Notice that the scores are ordered from least to greatest.

Give the five-number summary and the interquartile range for the data set.

Five-number summary

Minimum:

Lower quartile:

Median:

Upper quartile:

Maximum:

Interquartile range: