Equation 1 is 2W - 6 = L
equation 2 is 140= W * L
L=10
W=8
Answer:
Step-by-step explanation:
In order to solve for a slope, you must in the formula,
<u><em>(In this case, you can choose which point can have the x(1) and y(1) and which can have the x(2) and y(2)</em></u> )
1.) Plug the numbers for x(1), x(2), y(1) and y(2)
2.) Solve and simplify the number, which you should get
382 5/10-191 87/100
|
3828-191 87/100
3828-19187
——- ————
10. 100
19023
———-
100
The phrasing "nine times out of ten" means 9/10 = 0.90 = 90% is the confidence level. We're confident 90% of the time that the confidence interval captures the population parameter we're after (in this case mu = population mean)
The portion "have an average score within 5% of 75%" means that 75% = 0.75 is the center of the confidence interval, and it goes as low as 0.75 - 0.05 = 0.70 and as high as 0.75 + 0.05 = 0.80
This confidence interval is from 70% to 80%, meaning that nine times out of ten, we're confident that the average score is between 70% and 80%
We write the confidence interval as (0.70, 0.80). It's common to use the notation (L, U) to indicate the lower (L) and upper (U) boundaries. You might see the notation in the form L < mu < U. If so, then it would be 0.70 < mu < 0.80; either way they mean the same thing.
The margin of error is 0.05 as its the 5% radius of the interval. It tells us how far the most distant score is from the center (75%)
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In summary, we have these answers
- confidence level = 90%
- margin of error = 5% = 0.05
- confidence interval = (0.70, 0.80)
- interpretation = We're 90% confident that the average exam score is between 0.70 and 0.80
Answer:
5 3/5 is already a mixed number
3 4/9 is also already a mixed number
43/9 = 36/9 + 7/9 = 4 7/9
32/5 = 30/5 + 2/5 = 6 2/5
