Answer:
Step-by-step explanation:
The answer is d because all angles in parallelogram are the same
The answer is going to be number a
There is no background information on this
70 mph would be about the average speed you would need to go.
The standard deviation of the sampling distribution of the sample means is 20.8
What is Sample mean?
A sample is just a small part of a whole. For example, if you work for a polling company and want to know how much people pay for food a year, you aren’t going to want to poll over 300 million people. Instead, you take a fraction of that 300 million (perhaps a thousand people); that fraction is called a sample. The mean is another word for “average.” So in this example, the sample mean would be the average amount those thousand people pay for food a year.
The sample mean is useful because it allows you to estimate what the whole population is doing, without surveying everyone. Let’s say your sample mean for the food example was $2400 per year. The odds are, you would get a very similar figure if you surveyed all 300 million people. So the sample mean is a way of saving a lot of time and money.
Given that,
mean = = 20.8
standard deviation = σ = 4.2
n=89
So, The sampling distribution of the sample means is:
= =20.8
Hence,
The standard deviation of the sampling distribution of the sample means is 20.8
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