Use properties to find the sum or product 93+(68+7)
1 answer:
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Answer:
The 85% confidence interval for the mean per capita income in thousands of dollars is between $20.4 and $21.8.
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.
The lower end of the interval is the sample mean subtracted by M. So it is 21.1 - 0.7 = $20.4.
The upper end of the interval is the sample mean added to M. So it is 21.1 + 0.7 = $21.8.
The 85% confidence interval for the mean per capita income in thousands of dollars is between $20.4 and $21.8.
Step-by-step explanation:
ED is greater than BC
the line from B to ED ^ (which i drew ) the point it touches ED name it X. so EX will be 2 ( ED-BC)(6-4).
then u have a triangle. EX, XB and EB.
you have length of EX(2) and u have hypotenuse. so u can calculate XB using Pythagoras theorem.
15.1²=2²+XB²
15.1²-2²=XB²
224.01=XB²
XB=14.97
since XB and DC are parallel ( a rectangle is forming XBCD) so DC is also 14.97
