Answer:
D is the answer
Step-by-step explanation:
You just distribute the negative three and combine like terms
Using the z-distribution, a sample size of 180 is needed for the estimate.
<h3>What is a z-distribution confidence interval?</h3>
The confidence interval is:

The margin of error is given by:

In which:
is the sample mean.
is the standard deviation for the population.
In this problem, we have a 98% confidence level, hence
, z is the value of Z that has a p-value of
, so the critical value is z = 2.327.
The population standard deviation is of
, and to find the sample size, we have to solve for n when M = 4.
Hence:





n = 179.03.
Rounding up, as a sample size of 179 would result in an error slightly above 4, a sample of 180 is needed.
More can be learned about the z-distribution at brainly.com/question/25890103
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If we pay $8.28 for 18 stamps we can find the price of one stamp by dividing by 18.
So, the price of one stamp will be
$8.28 / 18 = $ 0.46
To find the price of 12 stamps we have to multiply by 12 and finally find
$0.46 * 12 = $5.52
Hence, the cost of 12 stamps is $5.52
Answer:
There's a rotation in our schedule if things we do everyday.
Step-by-step explanation:
Hope this helps :D