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andre [41]
3 years ago
14

On the basis of extensive tests, the yield point of a particular type of mild steel-reinforcing bar is known to be normally dist

ributed with σ = 100. the composition of the bar has been slightly modified, but the modification is not believed to have affected either the normality or the value of σ.
Mathematics
1 answer:
KiRa [710]3 years ago
6 0
1) The formula used for determining the confidence interval is
Sample mean +/- Critical value (or z-score corresponding to 90% confidence) * Standard
error of mean
8439 +/- 1.645 * 100/sqrt 25
8439 +/- 1.645 * 20
8439 +/- 32.9
2) The only difference in this case is finding the critical value i.e., z-score corresponding to 92% confidence which is 1.75 approximately
Then the confidence interval is
8439 +/- 1.75 * 100/sqrt 25
8439 +/- 1.75 * 20
8439 +/- 35
Lower limit is 8439 - 35 = 8404
The upper limit is 8439 + 35 = 8474
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siniylev [52]

Answer:

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Step-by-step explanation:

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Simplify both sides of the equation.

Cancel the common factor of  

32

Cancel the common factor.

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Rewrite the expression.

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Simplify  

32⋅5/8

Cancel the common factor of  

8

Factor  8  out of  32

x = 8 ( 4 ) ⋅ 5/8

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3 years ago
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PLEASE HELP, I’m confused. I don’t know how to do this stuff... explain your answer. Thank you!!!!
Maurinko [17]

Answer:

C) y = 2x + 3

Step-by-step explanation: You have to substitute 1 for x & 5 for y & 2 for m, but 1st do the point slope form ---> slope intercept form.

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4 0
3 years ago
What number makes 3 and 71 divisible by 9?
Snezhnost [94]
3 only 
<span>7 only </span>
<span>1 only </span>
<span>1, 4, and 7 </span>
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<span>if you add 1, 11+ 1 = 12 divisible by 3 </span>
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4 0
3 years ago
Hi, can you help me with this exercise, please !!
Rama09 [41]

Trigonometric identity

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undefined

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1 year ago
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