Answer:
 
So the answer for this case would be n=737 rounded up to the nearest integer
Step-by-step explanation:
We have the following info given:
 the sample mean
 the sample mean
 the sample deviation
 the sample deviation
 represent the sample size
 represent the sample size 
The degrees of freedom are given by:

The margin of error is given by this formula:
 (a)
    (a)
And on this case we have that ME =0.25 and we are interested in order to find the value of n, if we solve n from equation (a) we got:
 (5)
   (5)
The confidence level is 95% and the critical value for this case would be given by  , replacing into formula (5) we got:
, replacing into formula (5) we got:
 
So the answer for this case would be n=737 rounded up to the nearest integer
 
        
             
        
        
        
Step-by-step explanation:
a. that's the best answer that suits the question per day you multiply by 22
 
        
             
        
        
        
8=10-2 or
997=1000-3
so we can use distributive property
remember, a(b+c)=ab+ac
for the first one
8(997)=(10-2)(997)=997(10-2)=997(10)+997(-2)=9970-1994=7976
2nd one
8(997)=8(1000-3)=8(1000)+8(-3)=8000-24=7976
        
             
        
        
        
I think the answer would be 99
you multiply 9 and 11 and get 99
 
        
                    
             
        
        
        
I believe the answer is X=15