This is confusing please help

Mathematics

1 answer:

stira [4]2 years ago

3 0

Step-by-step explanation:

since we are using Pythagoras

c² = a² + b²

with c being the Hypotenuse (the baseline opposite of the 90° angle),

you want to get the expression

y² = 3² + 3²

so, you pick the ² and put it next to the y left of the "=" sign.

and to the right of the "=" sign you put 3, ², +, 3, ²

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Consider a normal population distribution with the value of σ known. (a) what is the confidence level for the interval x ± 2.81σ

sammy [17]

The confidence level would be 99.5%.

When we know the confidence level, we find the z-score by:
Dividing the CL by 100;
Subtracting this result from 1;
Dividing this result by 1;
Subtracting this result by 1.

Algebraically, this looks like:
$1-(\frac{1-(\frac{CL}{100})}{2})$

Using a z-table (http://www.z-table.com), we see that a z-score of 2.81 results in an area under the curve of 0.9975, so we now have
$1-(\frac{1-(\frac{CL}{100})}{2})=0.9975$

To begin solving this, we will subtract 1 from both sides:
$-(\frac{1-(\frac{CL}{100})}{2})=-0.0025
\\
\\(\frac{1-(\frac{CL}{100})}{2})=0.0025$

We will now multiply both sides by 2:
$1-\frac{CL}{100}=0.005$

Subtract 1 from both sides:
$-\frac{CL}{100}=-0.995
\\
\\\frac{CL}{100}=0.995$

Multiply both sides by 100:
CL = 99.5

7 0

3 years ago

PLEASE HELP ASAP PLEASE THANK YOU

11111nata11111 [884]

Answer:

what grade is this

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers

6c-9d=111 5c-9d=103 how to solve this problem

Tema [17]