DESPERATELY NEED HELP, please answer!

Step-by-step explanation:

I think there is a mistake in the problem description.

f and p are for the price of 1 yards fencing and 1 post.

and not the amounts.

because the problem description gives us the amounts already (30+8 yards fencing and 4 posts).

based on the 8 more yards of fencing for $256 we know that 1 yard of fencing costs $32.

we know from the beginning

30f + 4p = 1040

and again

8f = 256

f = $32

now using that in the first equation

30×32 + 4p = 1040

960 + 4p = 1040

4p = 80

p = $20

he bought first 30 and then additional 8 yards of fencing for $32 per yard, and 4 posts for $20 per post.

altogether he had to pay 1040+256 = $1296

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify