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The amount of time people spend in the bathroom per week follows a normal distribution with...

The amount of time people spend in the bathroom per week follows a normal distribution with a mean of 420 minutes and a standard deviation of 48 minutes. What is the minimum number of minutes we could expect the longest 20 % of people will spend in the bathroom in a week?

i. Which of the following illustrates the shaded area under the normal distribution for the top 20%?  

a.     b.  

ii. What is the minimum number of minutes we could expect the longest 20 % of people will spend in the bathroom in a week? (round time to the nearest whole minute)

Math   Statistics-And-Probability   
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