Answer: 25 can be an option.
Step-by-step explanation:
Interquartile range is defined as the difference between the third quartile and the first quartile.
we have 8 values, so the first quartile is the lower 25% of the data:
the 25% of 8 is:
0.25*8 = 2
So the first quartile is 18 + 20 = 38
the third quartile is 30 + 34 = 64.
So we can add any integer that does not affect the first or thid quartile and the interquartile range will remain unchanged, this is if we add a number right in the midle of our data set, for example, we could add a number between 22 and 26 (let's use 25) and the interquartile range will remain unchanged.
