Question

Let x be a random variable that represents the length of time it takes a student to complete a take-home exam in Dr. Larson’s psychology class. After interviewing many students, it was found that x has an approximately normal distribution with mean µ = 5.2 hours and standard deviation σ = 1.8 hours. Convert the x interval x ≥ 9.7 to a standard z interval.

Answer 1

Z = (score-mean)/SD

Z = (9.7-5.2)/1.8 = ?

Answer 2

2.5