Answer
median=235
mean=244
trimmed mean = 235
Work Step by Step
Rearrange the data set from smallest to largest
188, 195, 205, 214, 219, 251, 265, 283, 295, 325
n = 10 ,
trimmed n = 10 * 10% = 1, which 1 number will be removed
1)median = (5th + 6th)/2
=(219 + 251)/2
=235
2)mean = (188+195+205+214+219+251+265+283+295+325)/10
= 2440/10
= 244
3) Trimmed data set : 188, 195, 205, 214, 219, 251, 265, 283, 295
note: 325 is removed since it has the largest gap with the previous number compared to 188
Trimmed mean = (188+195+205+214+219+251+265+283+295)/9
=2115/9 = 235
