1) find the mean using standard deviation, raw score and z-score

a) standard deviation=20

Raw score=50

z-score= 1.25

B) standard deviation=16

Raw score=30

z-score= -0.75

C) standard deviation=16

Raw score=30

z-score=0

2) Find standard deviation

A)

Mean =50

RAW SCORE=60

Z-SCORE=1.25

B) MEAN=60

RAW SCORE=50

Z-SCORE= -1.25