statistics
posted by Gregory .
A population of N=8 scores has a mean of M =20. If one score is changed from X=14to X=30 , what would be the value for the new mean.

(a + 14)/8 = 20
(a + 30)/8 = m
a + 14 = 160
a + 30 = 8m

14  30 = 160  8m
8 m = 160 + 16 = 176
m = 176/8 = 22