The 2015 average commute time (in minutes) in a West Hills, Los Angeles, census tract was 29.9.

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The 2015 average commute time (in minutes) in a West Hills, Los Angeles, census tract was 29.9. Let X = commute time to work and Z = the usual standardized random variable. Assuming a normal distribution, and a standard deviation of 5 minutes, to find the probability of taking at least 25 minutes, which is the right notation: P(X ≥ 25), or P(Z ≥ 25)?

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