Answer:
A. 60
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:
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 
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.
We have to find:
n when 
. So
Dividing both sides by 3
We round up, so the correct answer is:
A. 60
Answer:
1.5%
Step-by-step explanation:
240=100
40=*
40 over 240 multiplied by 100%
Answer:
4355
Step-by-step explanation:
The initial cost is $45. To determine the increase, you need to follow two steps.
First you have to find what 7% of the original $45 is. This will tell us how much the cost will increase by.
To find 7% of $45, you need to multiply .07 x 45 = 3.15
This tells us that 7% of $45 = $3.15
Next, you have to add the increase to the original cost. This will be the new monthly cost.
$45 + $3.15 = $48.15
Answer:
The answer to this problem is B, C, and E.
Step-by-step explanation:
