convert the raw score of 30 and 48 to a z-score
Z score= (Xi-μ )/ δ
Where μ is the mean
δ is the standard deviation
Mean =30+48=78/2=39
Standard deviation= sqrt81=9
Z score of 30 = (30-39)/9
=-9/9= -1
Z score of 48 =(48-39)/9
= 9/9= 1
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