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2 years ago

Anybody there to talk

Mathematics

2 answers:

Anon25 [30]2 years ago

5 0

Answer:

yeah think so? have u done it?

Anni [7]2 years ago

4 0

Answer:

Yeah ,I am there!!!

Hi are u there?

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Christine took 3 tests and had an average of 76. She has one more test to take and she wants an average of 80. What is the lowes

amm1812

Answer: She has to score a minimum of 92 marks to take her average to 80

Step-by-step explanation:

Let the equation be

Three months total = 76 x 3 = 228

(x + 228) / 4 = 80

x + 228 = 80 x 4

x = 320 - 228

x = 92

6 0

3 years ago

(x+1) - 4 How do i determine the roots

irga5000 [103]

<h2>Solution:</h2>

To find the zero,

x + 1 - 4 = 0

x = 4 - 1

x = 3

3 is the root of (x + 1) - 4.

4 0

3 years ago

For each level of precision, find the required sample size to estimate the mean starting salary for a new CPA with 95 percent co

Rzqust [24]

Answer:

(a) Margin of error ( E) = $2,000 , n = 54

(b) Margin of error ( E) = $1,000 , n = 216

(c) Margin of error ( E) = $500 , n= 864

Step-by-step explanation:

Given -

Standard deviation $\sigma$ = $7,500

$\alpha$ = 1 - confidence interval = 1 - .95 = .05

$Z_{\frac{\alpha}{2}}$ = $Z_{\frac{.05}{2}}$ = 1.96

let sample size is n

(a) Margin of error ( E) = $2,000

Margin of error ( E) = $Z_{\frac{\alpha}{2}}\frac{\sigma}{\sqrt{n}}$

E = $Z_{\frac{.05}{2}}\frac{7500}{\sqrt{n}}$

Squaring both side

$E^{2} = 1.96^{2}\times\frac{7500^{2}}{n}$

$n =\frac{1.96^{2}}{2000^{2}} \times 7500^{2}$

n = 54.0225

n = 54 ( approximately)

(b) Margin of error ( E) = $1,000

E = $Z_{\frac{\alpha}{2}}\frac{\sigma}{\sqrt{n}}$

1000 = $Z_{\frac{.05}{2}}\frac{7500}{\sqrt{n}}$

Squaring both side

$1000^{2} = 1.96^{2}\times\frac{7500^{2}}{n}$

$n =\frac{1.96^{2}}{1000^{2}} \times 7500^{2}$

n = 216

E = $Z_{\frac{\alpha}{2}}\frac{\sigma}{\sqrt{n}}$

500 = $Z_{\frac{.05}{2}}\frac{7500}{\sqrt{n}}$

Squaring both side

$500^{2} = 1.96^{2}\times\frac{7500^{2}}{n}$

$n =\frac{1.96^{2}}{500^{2}} \times 7500^{2}$

n = 864

7 0

4 years ago

What is the volume of the cube?

weeeeeb [17]

Hi !
The volume of the cube is :
18 × 18 × 18= 5 832 mm³
The answer is D.

3 0

4 years ago

Solve for X 3x + 5=50

Nikolay [14]

Answer:

Let's solve!

Step-by-step explanation:

$3x + 5 = 50$

$-5$ $-5$

$\frac{3x}{3} = \frac{45}{3}$

$x = 15$

I hope this helps!

<h2>PLEASE MARK BRAINLIEST!</h2>

6 0

3 years ago

Read 2 more answers

Anybody there to talk​

Anybody there to talk