Kinda blurry sorry but which one?
2 answers:
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Disregard my earlier question.
Recall that the variance of a random variable
, denoted 
, is given by
where
denotes the expected value/mean of , and 
is the actual mean of .
Now, recall that
(a)
The standard deviation is the square root of the variance, so for (a) you have
That should give you an idea as to how to figure out the rest.
Recall that the variance of a random variable
where
Now, recall that
(a)
The standard deviation is the square root of the variance, so for (a) you have
That should give you an idea as to how to figure out the rest.
Answer:
34.98 square units.
Step-by-step explanation:
It is given that DEF is a triangle, EF=10, DF=7 and DE=12.
Information of sides of triangle is relevant to calculating area.
We should use Heron's formula.
According to Heron's formula, the area of triangle is
where,
For triangle DEF, let a=10, b=7 and c=12.
Now,
Area of triangle is
Therefore, the area of triangle DEF is 34.98 square units.