The quotient of 1/2 divided by 1 3/4
1 answer:
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Answer:
For this distribution of test scores, the standard deviation is equal to the square root of 9
D) 9
Step-by-step explanation:
We need to know the standard deviation formula:
(1)
Where:
S: Standard deviation
sum: Summation
x: Sample values
Am: Arithmetic mean
n: Number of terms, in this case 3
Now, we need to know the arithmetic mean of the sample values: 2, 5 and 8
To know the standard deviation we need to have the summation of each term minus the arithmetic mean squared.
of each term:
Now, we can find the standard deviation:
The standard deviation is equal to the square root of 9
Answer:
Step-by-step explanation:
On a unit circle, , so
in this case. If you look at the attached circle, the only time that the y-coordinate is
is when
and
, which correspond to angles of
and
respectively
