Answer: The interquartile range is 57
Explanation:
To find the interquartile range, we first need to find the median and calculate both the upper and lower quartile ranges. After, we need to subtract the lower quartile from the upper quartile
2,5,9,11,30,42,55,73,81
The median of this data set is 30.
The upper quartile range is the average of 55 and 73 which is (55+73)/2 which equals 64.
The lower quartile range is the average of 5 and 9 which is (5+9)/2 which equals 7.
Finally, to find the interquartile range, we need to subtract 7 from 64 which gives us 57.