Answer:
1.97
Step-by-step explanation:
The null hypothesis is:

The alternate hypotesis is:

Our test statistic is:

In which X is the sample mean,
is the hypothesis tested(null hypothesis),
is the standard deviation and n is the size of the sample.
In this problem, we have that:

So



Answer:
z= 1/3
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Answer:
618
Step-by-step explanation:
1st step: 6 x 3 x 412
2nd step: 7416 / 12
Final Answer: 618
Hope this helped!
30/75 = 12/x
30*x=75*12
30x=900/:30
x=30
Answer: It's good to think about things before doing them because it is more thought out and you have a better chance of getting things correct whereas without thinking your most likely going to get it wrong. Without thinking through your options you are basically guessing the answer. I hope this helped you have a great day and god bless you :D