your correct answer should be: z = (x - mean) / SD = (79 - 70) / 3 = 3
P (Z > 3)? = 1 - F (z) = 1 - F (3) = 0.00135 i hope this is helpful! :D
Okay. I think a good way to solve this problem is to write a proportion. 50/75 = x/120. Cross multiply to get 6,000/75x. Now, divide each side by 75 to isolate the “x”. When you do that, you get x = 80. 80 pounds of fertilizer will cover 120 square feet of lawn.
Sorry its hard to read and see