Answer:
a) 48.408
b) 1.235
Step-by-step explanation:
a)
The average hardness value xbar can be computed as
xbar=sum of values/number of values
xbar=(46.5+46.9+49.4+50.3+49.8+48.8+47+47.7+48.3+49.4+47.8+49)/12
xbar=580.9/12
xbar=48.408 (rounded to 3 decimal places).
The average hardness value is 48.408.
b)
The standard deviation hardness value s can be computed as

x              x-xbar  (x-xbar)
²
46.5  -1.90833	3.64174
46.9  -1.50833	2.27507
49.4    0.99167	0.98340
50.3     1.89167	3.57840
49.8     1.39167	1.93674
48.8    0.39167	0.15340
47.0           -1.40833	1.98340
47.7   -0.70833	0.50174
48.3           -0.10833	0.01174
49.4    0.99167  0.98340
47.8           -0.60833	0.37007
49.0    0.59167	0.35007
Total                               16.7692




s=1.235 (rounded to 3 decimal places)
The standard deviation hardness value is 1.235.
 
        
             
        
        
        
Answer:
A
Step-by-step explanation:
(fg)(x) = f(x)*g(x) = (5x-2)(1-2x) = 5x-10x^2-2+4x = a
 
        
             
        
        
        
Answer:
166
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
I believe your answer is B
 
        
             
        
        
        
Is there an equation for this?