Average Value: weight of water in filling tank

[soleilion]

1. water is run at a constant rate of 1 ft^3/min to fill a cylindrical tank of radius 3ft and height 5ft. Assuming that the tank is initially empty, make a conjecture about the average weight of the water in the tank over the time period required to fill it, and then check your conjecture by integrating. weight density of water is 62.4lb/ft^3

1/5 * int 62.4 9*pi*(5-x) between [0,5]

is this correct? I got correct answer

 

[stapel]

is this correct? I got correct answer

You know you have the correct answer, but you're wanting to know if you have the correct answer...? :shock:

I'm sorry, but I don't understand your post. Please clarify. Thank you!

Eliz.

 

[soleilion]

I use this formula to get correct answer
1/5 * int 62.4 9*pi*(5-x) between [0,5]

I want to know is this method correct? or even I got correct answer, but my method is wrong