can I post my Probability and Statistics question? or should I say questions.... I believe I can because this is the section of Probability and Statistics! duh! okay anyhoo on to my question! this question has me stumped more than a tree! haha get it! sorry anyhoo here it is, but before I write it there is two parts to this annyoing and confusing question for part A I showed my work but for part B I dont know how to do it! in fact I have no clue :eek: :confused:

Part A

A box of cookies contains a means of mass of 180g with a standard deviation of 2g. One box had a mass that correspondence to a z score of -1.5 how many grams of cookies did the box contain?

what I have done:

We have

-1.5 = (x - 180) / 2

-3 = x - 180,

x = 180 - 3 = 177 grams

Did I by miracle stumble on the right answer?

Part B:

if the mean mass of theses boxes is assumed to be normally distributed, what is the probability a box of cookies will contain less than 179g?

here the lightbulb in my head is trying so hard to turn on that it is already burnt! :o

anyhoo any help with theses Probability and Statistics question would be a huge greatfulness on my part! and if I could I would go through the computer and hug you! ;)