Oh period ..............................
Answer:
<em>0.000008</em>
Step-by-step explanation:
Since the exponent of the scientific notation is negative, move the decimal point 6 places to the left.
<em>0.000008</em>
<em>brainliest pls</em>
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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Answer:
C. - X = 5 units
Step-by-step explanation:
We need to solve for x from the given figure.
In ΔADB and ΔCDB
∠ABD=∠BCD (Corresponding angle of two right triangle)
∠ADB=∠CDB (Each 90°)
∴ ΔADB ≈ ΔCDB By AA similarity
If two triangles are similar then ratio of their corresponding height are same.
Substitute the value of side into the expression
Cross multiply and solve for x
x can't be negative because side of triangle is positive.
Hence, The value of x is 5 units.