Answer:
The minimum sample size that should be taken is 62.
Step-by-step explanation:
We have that to find our  level, that is the subtraction of 1 by the confidence interval divided by 2. So:
 level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of  .
.
So it is z with a pvalue of  , so
, so 
Now, find the margin of error M as such

In which  is the standard deviation of the population and n is the size of the sample.
 is the standard deviation of the population and n is the size of the sample.
If we want to be 90% confident that the sample mean is within 1 word per minute of the true population mean, what is the minimum sample size that should be taken
This is n when  . So
. So





The minimum sample size that should be taken is 62.
 
        
             
        
        
        
Answer:
$45.22
Step-by-step explanation:
The number of miles per gallon can be represented by the ratio: 

Since we know the unit rate of 26 miles per gallon of gas, we can set up a proportion, or equivalent ratios, to find the number of gallons needed for 420 miles:
 , where 'x' is the number of gallons of gas
, where 'x' is the number of gallons of gas
cross-multiply and divide:  26x = 420 or x ≈ 16.15 gallons
If gas is $2.80 per gallon, take the total number of gallons needed and multiply by $2.80: 
16.15 x $2.80 = $45.22 
 
        
             
        
        
        
Answer:
B,E and F are your answers
 
        
                    
             
        
        
        
Answer:
The probability that Bentely will be selected first = 0.046
Step-by-step explanation:
The person will be randomly selected, it is not stated that sex is considered in the selection.
The total number of people present at the party = 10 + 12 = 22
The probability that Bentely will be selected first = 1/22
The probability that Bentely will be selected first = 0.046
 
        
             
        
        
        
Answer:(7,3)
Step-by-step explanation: