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Exhausted Emily finally got a good night sleep last night! The number of hours that she slept corresponds to a $z$-score of $1.5$.
What is the proper interpretation of this $z$-score?
Emily slept $1.5$ hours more than usual last night.
The number of hours that Emily slept last night was $1.5$ times the median number of hours of sleep that she gets.
About $93\%$ of the time, Emily gets less sleep than she got last night.
The number of hours of sleep that Emily got last night was $1.5$ standard deviations above the mean number of hours of sleep that she gets.
Emily got $1.5$ hours of sleep last night.