Answer
a.
mean =23.15
median = 21
mode = 5,27
b.
10% trimmed mean = 22.278
Work Step by Step
a)
mean = $(12+27+8+15+5+9+18+13+35+23+19+33+41+59+3+26+5+34+51+27)/20 = 23.15$
median = $(10th + 11th) /2 = (19+23)/2 = 21$
mode = $5,27$
b)trimmed mean 10%>>> remove outlier data ({3},{59})
$= (12+27+8+15+5+9+18+13+35+23+19+33+41+26+5+34+51+27)/18
=22.278$
