a 15 foot long standard weight pipe with a diameter of 4 inches is filled with water. what would be the total approximate weight of the pipe and the water it contains?

If I recall my non-metric units, 1 cubic foot of water weighs about 62.4 pounds.

the volume of the tube is pi(1/36)(15) cubic feet
= 1.309 cubic feet

so the weight of the water is 1.309 x 62.4 lbs
= 8.38 lbs.

I have no clue what a "standard weight" pipe would weigh, google it then add it on.

Assuming you are talking about "standard" steel Schedule 40 pipe, use the table found here:
http://www.engineeringtoolbox.com/ansi-steel-pipes-d_305.html
You will probably find that the pipe wall weighs more than the water inside.

oops, don't know what happened in this typo

1.309 x 62.4 lbs is 81.68 lbs of course.

thanks!