Answer:
C. [21.80, 22.80]
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 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 22.3 - 0.5 = 21.8 hours.
The upper end of the interval is the sample mean added to M. So it is 22.3 + 0.5 = 22.8 hours
So the correct answer is:
C. [21.80, 22.80]
(54/100)*x = 81 => x = 8100/54=> x = 150;
Answer:
80 degrees
Step-by-step explanation:
180 is the max so 50 times 2 is one hundred and one hundred eighty minus 100 is 80
The answer is 4.5.
The formula for a rectangle is A = lw. Substitute the formula, so it'll be 27 = (2x - 3) * x. Evaluate the formula.
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–6x + 2y = 3/2
or, 2y= 6x + 3/2
or, y= (6x + 3/2)/2
or, y = 6x/2 + 3/4
or, y = 3x + 3/4
Therefore, –6x + 2y = 3/2 is Sandra's equation.