The answer is C....
Hope This Helps!!!!
        
                    
             
        
        
        
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
 
        
             
        
        
        
Answer:
(a)
Step-by-step explanation:
Given
4x - 1 = x ( subtract x from both sides )
3x - 1 = 0 ( add 1 to both sides )
3x = 1 ( multiply both sides by 10 )
30x = 10 → (a)
 
        
             
        
        
        
Answer:
a + b = 90°
Step-by-step explanation:
It’s obvious that this is a right angle then 
a + b = 90°