A stick is 7.5 inches in length. A carpenter will cut off one eighth of the stick. How long is the part to be cut off?
1 answer:
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Answer:
+ 2 = f
Step-by-step explanation:
So three friends and +6 for the tip in total.
Let's say our total paid is t and how much each friend pays is f.
+ 2 = f
I said this because the total paid was split between three, and then they paid 2 dollars for the tip each too.
Answer:
A sample of 3851 is required.
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 Z-table as such z has a p-value of .
That is z with a pvalue of , so Z = 2.327.
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.
Variance is 5.76 kWh
This means that
They would like the estimate to have a maximum error of 0.09 kWh. How large of a sample is required to estimate the mean usage of electricity?
This is n for which M = 0.09. So
Rounding up:
A sample of 3851 is required.