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shtirl [24]
2 years ago
15

M∠A = 40º

Mathematics
1 answer:
denis23 [38]2 years ago
7 0
180-40=140. 140/5 = 28

x= 28

angle B: 5(28) = 140
140 + 40 = 180

180=180
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The answer to this question asap please
Mkey [24]

At 13% significance level, there isn't enough evidence to prove the administrators to claim that the mean score for the​ state's eighth graders on this exam is more than 280.

<h3>How to state hypothesis conclusion?</h3>

We are given;

Sample size; n = 78

population standard deviation σ = 37

Sample Mean; x' = 280

Population mean; μ = 287

The school administrator declares that mean score is more (bigger than) 280. Thus, the hypotheses is stated as;

Null hypothesis; H₀: μ > 280

Alternative hypothesis; Hₐ: μ < 280

This is a one tail test with significance level of α  = 0.13

From online tables, the critical value at α  = 0.13 is z(c) = -1.13

b) Formula for the test statistic is;

z = (x-  μ)/(σ/√n)

z = ((280 - 287) *√78 )/37

z = -1.67

c) From online p-value from z-score calculator, we have;

P[ z > 280 ] =  0.048

d) The value for z = -1.67  is smaller than the critical value mentioned in problem statement z(c) = - 1.13  , the z(s) is in the rejection zone. Therefore we reject H₀

e) We conclude that at 13% significance level, there isn't enough evidence to prove the administrators to claim that the mean score for the​ state's eighth graders on this exam is more than 280.

Read more about Hypothesis Conclusion at; brainly.com/question/15980493

#SPJ1

5 0
1 year ago
Solve for x <br> log2(5x-4)=4 <br> Please show steps
lina2011 [118]

Answer:

x=1.2

Step-by-step explanation:

2(5x-4)=4

distribute 2 to 5x and -4

10x-8=4

add 8 to negative 8 and 4

10x=12

now divide both sides by 10

10x/10= 12/10

x=1.2

6 0
2 years ago
Solve for x in the equation x squared + 4 x minus 4 = 8.
Goryan [66]

Step-by-step explanation:

x² + 4x − 4 = 8

x² + 4x − 12 = 0

(x + 6) (x − 2) = 0

x = -6 or x = 2

5 0
2 years ago
Read 2 more answers
Justine correctly multipled the decials shown. How can the product be correct without three decial places 8.5 x 2.34 = 19.89
Sloan [31]

Answer:

The answer is "19.89".

Step-by-step explanation:

Given:

\to 8.5 \times 2.34

Solution:

     8.5 \times  2.34 \\-----\\

          340 \\

        255 \times

     \\ 17 0\times \times

-------\\

     19.890

\to 19.890 \approx 19.89

that's why the answer is correct.

6 0
3 years ago
What is the answer to this?
Alisiya [41]

Answer:

i think it was -(1/3)

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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