Wednesday

April 1, 2015

April 1, 2015

Posted by **Brad** on Tuesday, March 20, 2012 at 10:26pm.

with a mean of 40 minutes and standard deviation of 7 minutes. If you want to be

95% certain that you will not be late for an office appointment at 1:00pm, what is the

latest time that you should leave home?

- Statistics -
**MathMate**, Tuesday, March 20, 2012 at 10:42pmFrom a normal distribution table (example

http://www.math.unb.ca/~knight/utility/NormTble.htm

)

look up the z-value for 95% probability, which is 1.645.

μ=40 minutes, σ=7 minutes.

Calculate n from the transformation of x to z as follows:

z=(x-μ)/σ

x=σz+μ

Everything on the right hand side is know, so calculate x required.

**Answer this Question**

**Related Questions**

statistics - Waiting times at a doctor office are normally distributed with a ...

statistics - Waiting times at a doctor office are normally distributed with a ...

statistics - Times for a surgical procedure are normally distributed. There are ...

Statistics - The time to fly between New York City and Chicago is normally ...

Stats - Suppose the time it takes for a purchasing agent to complete an online ...

Statistics - A hospital claims that the mean waiting time at its emergency room...

statistics - Let x denote the time taken to run a road race. Suppose x is ...

statistics - the scheduled commuting time on Long Island Rail Road from Glen ...

statistics - Suppose the amount of time it takes for statistics students to ...

statistics - The time required to travel downtown at am on Monday morning is ...