2 Using the information below find a The z score for each st

2. Using the information below, find a. The z score for each student. b. Which student performed better within their class? c. The Coefficient of Variation for both Art and Theater classes d. Which Class was more variable? e. What would be the range of grades for the ART students that would cover at least 88.89% of the students?

Solution

Z=(48-55)/7

Z= -1.0

Z=(80-70)/5

Z= 2.0

c)coffecient of variance = C_v = Standard Deviation / Mean

C=7/55 = 0.127

C=5/70 = 0.0714

d) Art class student are more variable