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Alenkasestr [34]
3 years ago
13

Please show work, as well (if you can)

Mathematics
1 answer:
AysviL [449]3 years ago
6 0
I hope this helps you

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I need help!!!!!!<br> Help Needed!!!!
tatiyna

help with what? be sure to put everything you need to say into a question

5 0
3 years ago
A worker is taking boxes of nails on an elevator, each box weighs 54lb. The weight of the worker is 170lb. Write an inequality d
Tanya [424]

Answer: y=54(lb)x+170(lb)

Step-by-step explanation: that's the function for it but I tried. You need to include how much weight the elevator can hold though

6 0
3 years ago
Miguel is setting up his new classroom with total floor space of 1,600 ft?. The classroom must contain two square
Liula [17]

Answer:

The first answer is 3, and the second answer is groups of 3 allow 4 rows of 9 students.

Step-by-step explanation:

Not sure I guessed on the question and got it right, just trying to help people out.

4 0
3 years ago
Read 2 more answers
A manufacturer produces piston rings for an automobile engine. It is known that ring diameter is normally distributed with σ=0.0
oksian1 [2.3K]
<h2>Answer with explanation:</h2>

The confidence interval for population mean is given by :-

\overline{x}\pm z^* SE                   (1)

, where \overline{x} = sample mean

z* = critical value.

SE = standard error

and SE=\dfrac{\sigma}{\sqrt{n}} , \sigma = population standard deviation.

n= sample size.

As per given , we have

\overline{x}=74.021

\sigma=0.001

n= 15

It is known that ring diameter is normally distributed.

SE=\dfrac{0.001}{\sqrt{15}}=0.000258198889747\approx0.000258199

By z-table ,

The critical value for 95% confidence  = z*= 1.96

A 99% two-sided confidence interval on the true mean piston diameter :

74.021\pm (2.576) (0.000258199)     (using (1))

74.021\pm 0.000665120624

74.021\pm 0.000665120624\\\\=(74.021- 0.000665120624,\ 74.021+ 0.000665120624)\\\\=(74.0203348794,\ 74.0216651206)\approx(74.020,\ 74.022)  [Rounded to three decimal places]

∴  A 99% two-sided confidence interval on the true mean piston diameter  = (74.020, 74.022)

By z-table ,

The critical value for 95% confidence  = z*= 1.96

A 95% lower confidence bound on the true mean piston diameter:

74.021- (1.96) (0.000258199)    (using (1))

74.021- 0.00050607004=74.02049393\approx74.020 [Rounded to three decimal places]

∴  A 95% lower confidence bound on the true mean piston diameter= 74.020

7 0
3 years ago
Translate and solve: 639 is what percent of 142?
Andre45 [30]

Answer:

450

Step-by-step explanation:

639 is what percent of 142? = 450.

4 0
3 years ago
Read 2 more answers
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