At a local restaurant, the amount of time that customers have to wait for their food is normally distributed with a mean of 20 minutes and a standard deviation of 5 minutes. Using the empirical rule, what percentage of customers have to wait between 5 minutes and 35 minute?
Added by Alexander F.
Step 1
The mean is 20 minutes and the standard deviation is 5 minutes. So, 5 minutes is 3 standard deviations below the mean (20 - 5 = 15, 15/5 = 3) and 35 minutes is 3 standard deviations above the mean (35 - 20 = 15, 15/5 = 3). According to the empirical rule Show more…
Show all steps
Close
Your feedback will help us improve your experience
Steven Clarke and 77 other Intro Stats / AP Statistics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
At a local restaurant, the amount of time that customers have to wait for their food is normally distributed with a mean of 34 minutes and a standard deviation of 5 minutes. Using the empirical rule, determine the interval of minutes that the middle 95% of customers have to wait.
Danielle F.
At a local restaurant, the amount of time that customers have to wait for their food is normally distributed with a mean of 18 minutes and a standard deviation of 4 minutes. Using the empirical rule, determine the interval of minutes that the middle 68% of customers have to wait.
Allison K.
Waiting Time The waiting time $t$ for service in a store is exponentially distributed with a mean of 5 minutes. (a) Find the probability density function of the random variable $t$ (b) Find the probability that $t$ is within one standard deviation of the mean.
Probability and Calculus
Expected Value and Variance
Recommended Textbooks
Elementary Statistics a Step by Step Approach
The Practice of Statistics for AP
Introductory Statistics
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD