A hardware store sells a 5-pound box of nails for $16.80. The store is having a 20 percent off sale on all merchandise. What is
2 answers:
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we know that
The equation of a vertical parabola in vertex form is equal to
where
(h,k) is the vertex
if -----> then the parabola open upward (the vertex is a minimum)
if -----> then the parabola open downward (the vertex is a maximum)
The axis of symmetry is equal to
In this problem let's analyze two cases
First case
the vertex is the point
so
-----> then the parabola open upward (the vertex is a minimum)
The axis of symmetry is equal to
Second case
the vertex is the point
so
-----> then the parabola open upward (the vertex is a minimum)
The axis of symmetry is equal to
Answer:
The answer of this question is x-1.
Standard the random variable 
using the transformation
where
and 
are the mean and standard deviation of , respectively.
Now, you can recall that for any normal distribution, approximately 95% of its data falls within 2 standard deviations of the mean, so to either side, there is approximately 2.5% of data that falls below 2 standard deviations from the mean, and 2.5% that falls
above . In other words, 
.
where
Now, you can recall that for any normal distribution, approximately 95% of its data falls within 2 standard deviations of the mean, so to either side, there is approximately 2.5% of data that falls below 2 standard deviations from the mean, and 2.5% that falls