Answer:
C) (0,0)
Step-by-step explanation:
(0,0)
Answer:
average of the no. = sum of all no. / no. of terms
= 2 + 5 + 8 + 1 / 4
= 16/4
= 4
4 is the answer
This is the following way to solve this problem:
3x-10(x+2)=13-7x
3x-10x-20=13-7x (multiply 10 times what's in the parentheses)
-7x-20=13-7x ( subtract 3x from -10x)
-7x-20-13=-7x ( since the 13 is positive, when we move it to the other
side, we change it's sign, so now we subtract 13 from 20
-7x-7=-7x
-7=-7x+7x ( we do the same thing we did above, now with the -7x)
-7=x
x=-7
Answer: x = -7
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: )
Answer:
a) ![\hat p =\frac{Upper+Lower}{2}= \frac{0.47+0.63}{2}= 0.55](https://tex.z-dn.net/?f=%5Chat%20p%20%3D%5Cfrac%7BUpper%2BLower%7D%7B2%7D%3D%20%5Cfrac%7B0.47%2B0.63%7D%7B2%7D%3D%200.55)
b) ![ME = \frac{Upper-Lower}{2}= \frac{0.63-0.47}{2}= 0.08](https://tex.z-dn.net/?f=%20ME%20%3D%20%5Cfrac%7BUpper-Lower%7D%7B2%7D%3D%20%5Cfrac%7B0.63-0.47%7D%7B2%7D%3D%200.08)
c) For this case in order to find the number of people who would support the bike lanes we just need to multiply the estimated proportion by the total size and we got:
![X = 0.55* 75783= 41680.65 \approx 41681](https://tex.z-dn.net/?f=%20X%20%3D%200.55%2A%2075783%3D%2041680.65%20%5Capprox%2041681)
Step-by-step explanation:
For this case we have an interval for the true proportion of adults in a certain town who want to add bike lanes to a major roadway:
![0.47 \leq p \leq 0.63](https://tex.z-dn.net/?f=%200.47%20%5Cleq%20p%20%5Cleq%200.63)
Part a
For this case the point of estimate is given by:
![\hat p =\frac{Upper+Lower}{2}= \frac{0.47+0.63}{2}= 0.55](https://tex.z-dn.net/?f=%5Chat%20p%20%3D%5Cfrac%7BUpper%2BLower%7D%7B2%7D%3D%20%5Cfrac%7B0.47%2B0.63%7D%7B2%7D%3D%200.55)
Part b
We can estimate the margin of error with this formula:
![ME = \frac{Upper-Lower}{2}= \frac{0.63-0.47}{2}= 0.08](https://tex.z-dn.net/?f=%20ME%20%3D%20%5Cfrac%7BUpper-Lower%7D%7B2%7D%3D%20%5Cfrac%7B0.63-0.47%7D%7B2%7D%3D%200.08)
Part c
For this case in order to find the number of people who would support the bike lanes we just need to multiply the estimated proportion by the total size and we got:
![X = 0.55* 75783= 41680.65 \approx 41681](https://tex.z-dn.net/?f=%20X%20%3D%200.55%2A%2075783%3D%2041680.65%20%5Capprox%2041681)
Let, that number = x
It would be: x * 25% = 21
x * 0.25 = 21
x = 21 / 0.25
x = 84
In short, Your Answer would be 84
Hope this helps!