What is the standard deviation of the data set 21 ,6,18,21,20,14,19
1 answer:
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Answer:
The value of x is 4.
Step-by-step explanation:
Given:
Let B be between A and C.
To Find:
x=?
Solution:
B be between A and C as shown in Figure
A-B-C such that
...........Line Addition Property
Substituting the given values we get
The value of x is 4.
Answer: 0.4667
Step-by-step explanation:
According to 68–95–99.7 rule , About 99.7% of all data values lies with in 3 standard deviations from population mean ().
Here , margin of error = 3s , where s is standard deviation.
As per given , we have want our sample mean to estimate μ μ with an error of no more than 1.4 point in either direction.
If 99.7% of all samples give an within 1.4 , it means that
Divide boths ides by 3 , we get
Hence, So must have 0.4667 as standard deviation so that 99.7 % 99.7% of all samples give an
within 1.4 point of μ .
Answer:
2x
Step-by-step explanation:
We can first pull the x out of every term:
Then, simplify:
So, the answer is 2x.