The extract of a plant native to Taiwan has been tested as a possible treatment for Leukemia. One of the chemical compounds produced from the plant was analyzed for a particular collagen. The collagen amount was found to be normally distributed with a mean of 73 and standard deviation of 7.7 grams per mililiter.

Question

The extract of a plant native to Taiwan has been tested as a possible treatment for Leukemia. One of the chemical compounds produced from the plant was analyzed for a particular collagen. The collagen amount was found to be normally distributed with a mean of 73 and standard deviation of 7.7 grams per mililiter.
(a)  What is the probability that the amount of collagen is greater than 63 grams per mililiter?

ANSWER:.9015

(b)  What is the probability that the amount of collagen is less than 78 grams per mililiter?

ANSWER: 1-.2578

(c)  What percentage of compounds formed from the extract of this plant fall within 3 standard deviations of the mean?

ANSWER:

I got A and B right, just confused on C

Damon · Answer

check here: http://davidmlane.com/normal.html