Answer:

Step-by-step explanation:
-For a known standard deviation, the sample size for a desired margin of error is calculated using the formula:

Where:
is the standard deviation
is the desired margin of error.
We substitute our given values to calculate the sample size:

Hence, the smallest desired sample size is 23
Answer:
<h2> B. 31,400 mm2</h2>
Step-by-step explanation:
We know that the bull's eye target has a diameter of 20 centimeters, which equals 200 milimeters.
So, we find the area

Therefore, the right answer is B.
Answer:
Express 23175.4 in standard form
Step-by-step explanation: