Outlier data point more than 1.5 interquartile range IQR below Q1 or above Q3 also both
Ex
-8, 2, 5, 6, 9, 12, 22
Q1 Q2 Q3 1. Put in order
2. Q1=2
To find outlies: Q3=12
1 Q1-1.5(IQR) 3. IQR ~ subtract Q3-Q1
2-1.5(10)
2-15= -13
2 Q3+1.5(IQR)
12+1.5(10)
12+15=27
outlier
no number less then -13 NO OUTLIER no number greater then 27
PROBLEM:
111, 121, 159, 171, 179, 197, 325
Q1 Q2 Q3
Subtract 121 from 197; 197-121=?
Then; 121-1.5(***)=?
Next; 197+1.5(***)+?
Once you have those numbers find the number that is less than Q1(then) or/and greater than Q3(next)