-7(7-4b) -8What will be the answer if I change it
1 answer:
Hi there! :)
<u><em>Answer:</em></u>
<u><em>=28b-57</em></u>
<u><em>*The answer must have a positive sign.*</em></u>
Step-by-step explanation:
<h2><u>Lesson: Distributive property</u></h2>Distributive property: a(b+c)=ab+ac
First, you expand or multiply by the numbers from left to right.
It change positive to negative sign.
Finally, you add/subtract by the numbers from left to right.
It change positive to negative sign.
<em><u>Final answer is 28b-57</u></em>
I hope this helps you!
Have a nice day! :)
-Charlie
:D
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Answer:
The minimum sample size that we should consider is of 60 employees.
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 want our 99 percent confidence interval to have a margin of error of no more than plus or minus 2 minutes. What is the smallest sample size that we should consider?
We need to find n for which
So
Simplifying by 2
Rounding up
The minimum sample size that we should consider is of 60 employees.