Answer:
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Step-by-step explanation:
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5s or 2 is the correct answer.
Answer:
11.3097335 seems to have nothing with the question so the answer is
B) 18.8495559
Step-by-step explanation:
to find the perimeter (circumference?) do 2pi(r)
2 pi 3 = pi 6 = 18.8495559
since there is 40 percent missing, multiply the perimeter by 60% (part not missing)
18.8495559 * 60%
11.3097335
Answer:
See below for answers and explanations
Step-by-step explanation:
<u>Part A</u>
Assuming that conditions have been met for the interval, we use the formula
where
represents the sample mean,
represents the critical value,
represents the sample standard deviation, and
is the sample size.
The critical value of
for an 80% confidence level with degrees of freedom
is equivalent to 
Thus, we can compute the confidence interval:

Therefore, we are 80% confident that the true mean age of all customers is between 30.17 and 35.11 years.
<u>Part B</u>
The margin of error is 