Calculate the interquartile range of the following data 17, 18, 18, 19, 20, 21, 21, 23, 25

4

Step-by-step explanation:

17, 18, 18, 19, 20, 21, 21, 23, 25

find the median first:

17, 18, 18, 19, 20, 21, 21, 23, 25

median: 20  

let's find the median of the lower half also known as Q1 (we won't include the 20)

lower quartile Q1            median     upper quartile Q3              

17, 18, 18, 19                       20             21, 21, 23, 25

(18+18 = 36, 36 ÷ 2 = 18)                 (21+23 = 44, 44÷2 = 22)

Q1: 18

Q3: 22

22 - 18 (Q3 - Q1)

22 - 18 = 4

Interquartile Range (IQR) = 4

step-by-step explanation: you take each of the numbers and divide by the amount then you take the range

quit

step-by-step explanation: