Convert each individual X data value to a standardized Z value and interpret it.
a. Class exam: John’s score is91, µ = 79,σ = 5
b. Student GPA: Mary’s GPA is 3.18, µ =2.87,σ = 0.31
c. Weekly study hours: Jaime studies 18 hours, µ = 15.0, σ = 5.0
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