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katrin2010 [14]
3 years ago
8

Find the angles of a, b, c and d in the diagram

Mathematics
2 answers:
irina [24]3 years ago
6 0
I don’t know which diagram send a pic
lawyer [7]3 years ago
3 0
What is the diagram?
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On a test that has a normal distribution, a score of 19 falls one standard deviation below the mean, and a score of 40 falls two
nexus9112 [7]

Hi there!

We can use the following equation:

\large\boxed{z = \frac{x-\mu}{\sigma}}

z = amount of standard deviations away a value is from the mean (z-score)

σ = standard deviation

x = value

μ = mean

Plug in the knowns for both and rearrange to solve for the mean:

-1 = \frac{19-\mu}{\sigma}\\\\-\sigma = 19 - \mu\\\\ \sigma = -19 + \mu

Other given:

2 = \frac{40-\mu}{\sigma}\\\\2\sigma = 40- \mu\\\\ \sigma = 20 - \frac{\mu}{2}

Set both equal to each other and solve:

-19 + \mu = 20 - \frac{\mu}{2}\\\\\frac{3\mu}{2} = 39 \\\\3\mu = 78 \\\\\boxed{\mu = 26 }

5 0
2 years ago
Help me with math please
xenn [34]
Yes I agree with that
7 0
3 years ago
I need help with my math homework it is algebra
Ivahew [28]
What are the math problems?
6 0
2 years ago
2) The length of a step is 12 inches. In order to comply with safety regulations, the angle of elevation must be 60 degrees. Wha
Papessa [141]

12√3 / 12

Step-by-step explanation:

this creates a 30,60,90 triangle and since we are trying to find the rising part of the run we are going to have to find the 60-degree angle part. So then we do 12 times root 3.

4 0
2 years ago
The graph shows the system ​{y=2x+1y=2x2+1 .​
vitfil [10]
We have that
<span>the system
y=2x+1
y=2x</span>²<span>+1

using a graph tool
see the attached figure

the
solution are the points
(0,1) and (1,3)

the answer is
</span><span> (0, 1) ​ and ​ (1, 3) </span>

4 0
2 years ago
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