NediaMaster

Mean is the 40 because (25+55+40+65+29+45+59+35+25+37+52+30+8+40+55)/15=40

Standered deviation is 14.9086104875 because (25-40)^2=225 (Then do this for all the numbers you have) and then add them together, divide by 15 and take the square root.

Here's a helpful guide for next time:

He gets a discount of 9% off

(845*.09)=76.05 (Trade disocunt)

845-76.05=768.95 (Checking to make sure problem works out)

Hey, I'm not going to be rude but can you leave your problems up instead of editing and deleting it after someone answers it? Thank you!

Lets write this in a mathy way so this is easier to see.

6^1/2-5^1/2 =  

0.2134217652833884

This is an irrational number and can't be comverted to a fraction(I think)

Ten carbon atoms, 15 hydrogen atoms and 1 nittogen atom

Just post actual math question tho :P

I+I I guess 

(1/5)*(3/4)=

3/20

You multiply the numinators together and you multiply the denominators together!

Haha it was good! Just letting this guy know for the future though.

Well, you just posted this in the question catogory haha! You want to make your post off-topic so you don't get in trouble!