First we have to determine 30% of 12.
(30×12)÷100=3.6 so 3.6 is 30% of 12.
12 - 3.6= 8.4
Your answer is 8.4
 
        
             
        
        
        
Let 

 denote the random variable for the weight of a swan. Then each swan in the sample of 36 selected by the farmer can be assigned a weight denoted by 

, each independently and identically distributed with distribution 

.
You want to find

Note that the left side is 36 times the average of the weights of the swans in the sample, i.e. the probability above is equivalent to

Recall that if 

, then the sampling distribution 

 with 

 being the size of the sample.
Transforming to the standard normal distribution, you have

so that in this case,

and the probability is equivalent to

 
 
        
        
        
Step-by-step explanation:
when 11 is decreased by a number, the result is 413
 
        
             
        
        
        
Answer:
12x9y9
Step-by-step explanation:
( 4x3y3 ) 3
= 4x ⋅ 3 ⋅ 3y ⋅ 3 ⋅ 3 ⋅ 3
= 12x9y9