Answer:
0.918 is the probability that the sample average sediment density is at most 3.00
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 2.80
Standard Deviation, σ = 0.85
Sample size,n = 35
We are given that the distribution of sediment density is a bell shaped distribution that is a normal distribution.
Formula:
Standard error due to sampling:

P(sample average sediment density is at most 3.00)
Calculation the value from standard normal z table, we have,
0.918 is the probability that the sample average sediment density is at most 3.00
N=25 because 20 divided by 4 is 5 which is 1/5 of n meaning 5x5 is 25
29035 is a positive and -36198 is a negative
The Answer of x is 112.1
This is because all the angles sit on a 180 degree line so all the points have to add up to 180.
180-67.9=112.1
ANSWER:
112.1
Hope this helps have a good day!!! :))