The length of an instant message conversation is normally distributed with a mean of 5 minutes and a standard deviation of .7 minutes. What is the probability that a conversation lasts longer than 6 minutes?
0.045
0.077
0.955
0.922

Question

Vocaloid · Answer

@ThisGirlPretty calculate the z-score

z = (x - mean)/standard deviation where x is your "desired" value of 6 minutes

Vocaloid · Answer

then use a z-table/calculator to find the associated probability