Question

The length of a social media interaction is normally distributed with a mean of 3 minutes and a standard deviation of .4 minutes. What is the probability that an interaction lasts longer than 4 minutes?

Answer 1

So what I did i multiply 3 and the 4 which gave me 12  but that when I thought that didn't sound right at all so I thought you wanted the percentage. So instead I took 3 / 4 it gave me 0.75. So your answer should be 75%.
 
I do hope this helped, if not I am truly sorry for my mistake.

~Shadow