Standard Deviation Help

[pctecguy]

A railway’s records show trains between 2 cities arrive on the average 5.4 minutes late with standard deviation 1.3 minutes. What percent of these trains will arrive between 2.8 minutes late and 8.0 minutes late?

 

[mmm4444bot]

Hi Guy:

You need to make some statements about what you already understand, in this exercise.

Do you know the definition of standard deviation?

Are you familiar with finding areas underneath the curve that represents normal distribution?

What have you learned so far?

Please show whatever work that you can or explain what you're thinking, so that we might determine WHERE to begin helping you.

Nobody will know why you're stuck, until you tell us.

Cheers,

~ Mark