3 years ago

PLEASE HELP ME! THANK YOU !!

Mathematics

1 answer:

Aneli [31]3 years ago

4 0

Doamin of the function

inf

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The compressive strength of concrete is being tested by a civil engineer who tests 12 specimens and finds that the sample mean i

ki77a [65]

Answer:

The 95% confidence interval for mean compressive strength is:

$3237.3\leq \mu\leq 3282.5$

Step-by-step explanation:

We have a sample of n=12 specimens, with sample mean=3259.9 and sample standard deviation = 35.57.

We know the population is normally distributed.

For a 95% confidence interval and df=n-1=11, the t-statistic is t=2.201.

Then, the CI can be expressed as:

$M-t*s/\sqrt{N}\leq \mu\leq M+t*s/\sqrt{N}\\\\3259.9-2.201*35.57/\sqrt{12}\leq \mu\leq 3259.9+2.201*35.57/\sqrt{12}\\\\ 3259.9-22.6\leq \mu\leq 3259.9+22.6\\\\3237.3\leq \mu\leq 3282.5$

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3 years ago

If (p+2q)/p = 7/5 , find the value of q/p , where p ≠ 0

Yuri [45]

<h3>Answer: 1/5</h3>

Work Shown:

(p+2q)/p = 7/5

(p/p)+(2q/p) = 7/5

1 + 2(q/p) = 7/5

2(q/p) = 7/5 - 1

2(q/p) = 7/5 - 5/5

2(q/p) = (7-5)/5

2(q/p) = 2/5

q/p = (2/5)*(1/2)

q/p = (2*1)/(5*2)

q/p = 1/5

6 0

3 years ago

Read 2 more answers

Mercedes bought 2 1/2 pounds of blueberries and her son ate 1/4 the blueberries how many pounds of blueberries Are left?

iragen [17]

So all you do is you divide 2 1/2 by .25 and you get 10 then you know one fourth or 25% of that package is 10 berries so the rest or 30% left over is 30 berries.

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3 years ago

Find the three numbers in G.P. whose sum is 14 and whose<br>product is 64.

fenix001 [56]

2+4+8=14
2x4x8=64
2x4=8
8x8=64

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3 years ago

Plz help i cant figure out the second one

Georgia [21]

Answer:

y=-4x+50, y=2x-10 ( i think)

Step-by-step explanation:

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3 years ago