The confidence interval at 95% level is
7106.87 < μ< 14255.27
<h3>What is meant be mean and standard deviation?</h3>
The ratio of sum of observations to the total number of observation is known as mean. It is one of the central tendency in the statistics. It gives an idea about the central value present in the data. The most sensitive measure of central tendency is mean. It is very easy to calculate. Mean playa a crucial role in daily life. The two types of means are Arithmetic mean and Geometric mean.
Standard deviation is a measure in the statistics. The amount of variation of a set of values is known as standard deviation. Standard deviation is denoted by σ.
As per given data
90% confident level for amount of electricity used in community of Austin is
X-tx/2(n-1)s/√n < μ < X+ tx/2(n-1)s/√n
Here , n=12 , X=10681.07 , s=6893.87
Margin of error = tx/2(n-1)s/√n
=(1.796×6893.87)/√12
=3574.1996
=3574.19(approximately)
Therefore, 90% CI is,
10681.07-3574.19 ≤ μ<10681.07+3574.19
7106.87 < μ< 14255.27
To know more about mean and standard deviation, visit:
brainly.com/question/14720855
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90-n=3n hope this helps you
Answer:
Rotation was used to transform the figure.
Step-by-step explanation:
Since only one transformation was used, rotating the pre-image ABC 180° counterclockwise around the origin formed the image DEF.
I hope this helped! :-)
If Reginald answered 78% correctly out of a total 100%, we can subtract 78 from 100:
100 - 78 = 22
He answered 22% of the question incorrectly. But how do we find the bottom number? Remember what we said earlier. The <u>total</u> is 100%. He got 22% out of 100% wrong. Wouldn't that be 
?
Now that we know our fraction, we can reduce it. Let's start by dividing our fraction in half:
= 
Can we reduce that any more? No, because 11 can not be divided by anything else.
If you want the first fraction, go with , but if they want a reduced fraction, then would be best.
