statistics
posted by matt .
13) You are told that the mean height of trees around the Physics building is 8 feet tall, with a standard deviation of 1.5 feet. Which is the most appropriate statement you can make, based on this information?

choices:
a) About 68% of the trees are between 6.5 and 9.5 feet tall
b) About 75% of the trees are between 5 and 11 feet tall
c) At least 75% of the trees are between 5 and 11 feet tall
d) At least 75% of the trees are betwwen 6.5 and 9.5 feet tall 
Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores. 
There is a wooden fence around your water treatment plant that measures 6 feet tall and 95 feet long. Your supervisor has instructed you to determine how many square feet of area this fence has on both side so that you can panint it. He tells you not to count the two gates that measure 4 feet wide each because they are goning to be replaced. What is the square footage of this fence?