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4 years ago

Please help if you can! I'll mark brainiest if you're right;; Thank you in advance :D

Mathematics

1 answer:

Stels [109]4 years ago

5 0

Answer:

[83, 100]

Step-by-step explanation:

Lowest score to get a B is 80

Total 4 tests, to get at least a B : 80 x 4 = 320

Total 3 test scores = 81 + 62 + 94 = 237

So the fourth test to get at least a B: 320 -237 = 83

Answer [83, 100]

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Is 5+ 3 and 5-3 related facts explain

ololo11 [35]

Well maybe because the only thing that is different is the - and +

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3 years ago

Calculating the degrees of freedom, the sample variance, and the estimated standard error for evaluations using the t statistic

Yuliya22 [10]

Answer:

a) For the first part we have a sample of n =10 and we want to find the degrees of freedom, and we can use the following formula:

$df = n-1= 10-1=9$

d.9

b) $s^2 = \frac{SS}{n-1}= \frac{600}{41-1}= 15$

a.15

c) For this case we have the sample size n = 25 and the sample variance is $s^2 =400$ , the standard error can founded with this formula:

$SE = \frac{s^2}{\sqrt{n}}= \frac{400}{\sqrt{25}}= 80$

Step-by-step explanation:

Part a

For the first part we have a sample of n =10 and we want to find the degrees of freedom, and we can use the following formula:

$df = n-1= 10-1=9$

d.9

Part b

From a sample we know that n=41 and SS= 600, where SS represent the sum of quares given by:

$SS = \sum_{i=1}^n (X_i -\bar X)^2$

And the sample variance for this case can be calculated from this formula:

$s^2 = \frac{SS}{n-1}= \frac{600}{41-1}= 15$

a.15

Part c

For this case we have the sample size n = 25 and the sample variance is $s^2 =400$ , the standard error can founded with this formula:

$SE = \frac{s^2}{\sqrt{n}}= \frac{400}{\sqrt{25}}= 80$

8 0

3 years ago

Solve for x: 3x − 2(6 − x) = 7x + 2(5 + x) − 6

Ugo [173]

X=-4 I hope this helps

3 0

4 years ago

NO LINKS OR FILES. Explain how to evaluate 5p + (-6) when p = -4. Please give an explanation.

alexdok [17]

Answer:

-26

Step-by-step explanation:

5p + (-6)

Let p=-4

5(-4) + (-6)

Multiply

-20 +-6

Add

-26

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3 years ago

Read 2 more answers

Answer choices for both of them are <br> A) linear<br> B) exponential <br> C) quadratic

shutvik [7]

Answer:

#16 is linear but idk what 17 is

3 0

3 years ago