Main content
Course: High school statistics?>?Unit 2
Lesson 5: Normal distribution calculations- Standard normal table for proportion below
- Standard normal table for proportion above
- Normal distribution: Area above or below a point
- Standard normal table for proportion between values
- Normal distribution: Area between two points
- Finding z-score for a percentile
- Threshold for low percentile
- Normal calculations in reverse
? 2024 Khan AcademyTerms of usePrivacy PolicyCookie Notice
Normal calculations in reverse
You might need: Calculator,Z table
Problem
The distribution of durations for which apartments remain empty after the resident moves out for one property management company over the past years was approximately normal with mean days and standard deviation days.
The property management company tags the files of the apartments that were empty for the shortest of durations to have priority cleaning the next time their residents move out.
What is the maximum duration for which an apartment remained empty for the company to tag its file?
Round to the nearest whole number.