I know I have to use the equation "Z = x - mean/standard deviation" and then look up the AUC in a table for all of these questions, but all these problems are different. And if anyone knows of any good statistics websites, please link to it!
The brain weights of a certain population of adult Swedish males follow approximately a normal distribution with mean 1,400 g and standard deviation 100g. What percentage of the brain weights are:
a) 1325 and 1500g?
b) 1325g or more?
c) 1500g or less?
d) between 1475 and 1600g?
04-04-2008, 12:33 AM #1
Statistics Problems (Normal Distribution) (Reps)***Fulfilling My Destiny Crew***
***Alexander The Great Crew***
***Bill Burr Crew***
04-04-2008, 12:36 AM #2
04-04-2008, 12:44 AM #3
- Join Date: Jun 2007
- Location: Connecticut, United States
- Age: 28
- Posts: 6,048
- Rep Power: 6415
The (1400 - 1500) / 100 = 1 std deviations = 0.1587 (right tailed). Subtract that **** and you get....(.7734 - .1587) = .6147
Just thing logically and use this website http://www.tutor-homework.com/statis...cs_tables.html
Note: I am fairly buzze dand I accept no responsibility for the correctness of your answersNothing can stop the man with the right mental attitude from achieving his goal; nothing on earth can help the man with the wrong mental attitude.
"The first lesson of economics is scarcity: There is never enough of anything to satisfy all those who want it. The first lesson of politics is to disregard the first lesson of economics." -- Thomas Sowell