Answer:
Step-by-step explanation:
Given that each of 165 newly manufactured items is examined and the number of scratches per item is recorded (the items are supposed to be free of scratches), yielding the following data
x	freq	x*f	x^2*f
    
0	25	0	0
1	34	34	34
2	37	74	148
3	29	87	261
4	19	76	304
5	8	40	200
6	8	48	288
7	5	35	245
    
 165	394	1480
 Mean	2.387878788	8.96969697
 Variance	3.267731864  
We get E(x) = 2.388 and hence unbiased estimator of mu is 2.388
b) Variance = 3.268 
 
        
             
        
        
        
Answer:
i think the answer is 4.......
Step-by-step explanation:
 
        
             
        
        
        
Answer:
d(x) = √[(x - 2)² + (3x - 1)²]
Step-by-step explanation:
The distance between two points with coordinates (x₁, y₁) and (x₂, y₂) is given as 
d = √[(x₂ - x₁)² + (y₂ - y₁)²]
So, the distance between point (2,0) and a point (x,y)
d = √[(x - 2)² + (y - 0)²]
d = √[(x - 2)² + (y)²]
But the point (x,y) is on the line y = 3x - 1
We can substitute for y in the distance between points equation. 
d(x) = √[(x - 2)² + (3x - 1)²]
QED! 
 
        
             
        
        
        
Answer:
k=9
Step-by-step explanation:
