Percentages if values

Will you please explain to me how I should set up and solve this problem?
In a normal distribution with mu = 200 and standard deviation = 30, Find the percentages of values that are:

(a) Between 170 and 195
(b) Less than 100
C) Greater than 175
D) Between 200 and 230

Thanks, English
Last edited:


TS Contributor
This type of problem is explained in our Examples section - the post is titled "The Vaunted Normal Distribution."