I NEED HELPWhich graph shows the solution to the inequality? -3x -7 < 20
1 answer:
<h3>Answer: graph B</h3>
Open hole at -9; shading to the right
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Explanation:
First we need to isolate x.
The inequality sign flips because we divided both sides by a negative number.
The graph of x > -9 will have an open hole at -9 and shading to the right.
This matches <u>graph B</u>
An open hole is used to tell the reader that the endpoint -9 is not part of the solution set. If we wanted to include it, then we'd have to involve "or equal to" as part of the inequality sign.
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Answer:
The upper confidence limit of a 92% confidence interval for the population mean of grade point average is 2.93.
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 upper end of the interval is the sample mean added to M. So it is 2.89 + 0.04 = 2.93.
The upper confidence limit of a 92% confidence interval for the population mean of grade point average is 2.93.