which of the following choices is the standard deviation of the sample shown below here 17,18,19,20,21
1 answer:
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This kind of assignment can be one on a calculator; I typed in stdDev(17,18,19,20,21) an got std dev= 1.58.
working backward, the variance is the square of that: 2.5.
To find the variance: Find the mean of the given set of numbers. It is
17+18+19+20+21 95
------------------------- = ----- = 19
5 5
and then calculate the deviations of all 5 numbers from the mean:
17-19=-2
18-19= -1
19-19=0
20-19 = 1
21-19=2
Then sum up the squares of these: 4+1+0+1+4 = 10
Finally, divide this result by 5-1 (one less than the # of data points):
10
------- = 2.50 (variance)
(5-1)
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You have to subtract both sides by 64 and you will get,
-50 = 5z. Then divide both sides by 5, and you get -10 = z.
Answer:
53
Step-by-step explanation:
72 = x + 3x - 4
72 = 4x - 4
72 + 4 = 4x - 4 + 4
76 = 4x
76/4 = 4x/4
x = 19
3(19) - 4 = 53
Hope this helps!
A circular plot is watered by a sprinkler that rotates through it. The sprinkler only rotates through a semi-circle, or half of the whole circle.
Area of a circle: A = pi x r^2
r = 160 / 2 = 80
A = pi x 80^2
A = 6400pi / 2 = 3200pi
3200pi = 10053.0965
The area water is approximately 10,053 ft^2.
Hope this helps!! :)
Please delete this answer.
Answer: The value of A would be 2.
