Posted by **Sue 620** on Thursday, June 13, 2013 at 7:58pm.

The International Bottled Water Association says that Americans on the average drink 4.6 (8-oz.) servings of water a day. Assume that the number of 8-oz. servings of water is approximately normally distributed with a standard deviation of 1.4 servings. (Give your answers correct to four decimal places.)

(b) What proportion of Americans drink less than half the recommended 8 servings?

- Math help -
**PsyDAG**, Friday, June 14, 2013 at 1:22pm
"less than half" = less than 2.3

Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

- Math check -
**Tom7**, Friday, June 14, 2013 at 2:01pm
z=(8-2.3)/1.4=4.07 graph 0.99998

is this the right way and how do you change the graph numbers since they are all 9's that would need to be rounding?

- Math help -
**Sue 620**, Friday, June 14, 2013 at 2:05pm
I worked it and got a different answer for the graph number 0.9893 and tom worked and got something totally different, what are we doing wrong, trying to work together on some of these?

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