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sattari [20]
3 years ago
13

A manufacturer produces piston rings for an automobile engine. It is known that ring diameter is normally distributed with σ = 0

.001 millimeters. A random sample of 15 rings has a mean diameter of x = 74.036 millimeters.
(a) Construct a 99% two-sided confidence interval on the mean piston ring diameter.
(b) Construct a 99% lower-confidence bound on the mean piston ring diameter. Compare the lower bound of this confidence interval with the one in part (a).
Mathematics
1 answer:
Lubov Fominskaja [6]3 years ago
8 0

Answer:

The answer along with the explanation is provided in the attached document.

Explanation:

The explanation is given in attached document file.

Download docx
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Explain how to write and evaluate an algebraic expression.
ziro4ka [17]

Answer:

  • 40/n - 13
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Step-by-step explanation:

Thirteen less than the quotient of forty and a number. Required equation:

  • 40/n - 13

<u>When n = 2 we have:</u>

  • 40/2 - 13 = 20 - 13 = 7
6 0
3 years ago
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How much did the roses cost?
Lubov Fominskaja [6]

Answer: The roses costed $9

Step-by-step explanation:

3 multiplied by 3 equals 9

1 multiplied by 6 equals 6

9+6=15

6 0
3 years ago
The manager of a company uses the function shown to model the company’s daily profit based on the price of a product in dollars,
just olya [345]

Answer: 1) The minimum price, in dollars, to avoid a loss = 22,

2) the maximum price in dollars , to avoid a loss = 53,

3) The price that results the maximum profit = 37.5 dollars

Step-by-step explanation:

Since the given function that shows the total profit,

f(x) = (x-22)(53-x)

Where x is the price of the product.

Since for avoiding the loss,

f(x) \geq 0,

⇒ (x-22)(53-x)\geq 0

If (x-22)\geq 0 \implies x\geq 22

If 53 - x \geq 0 \implies 53 \geq x

Thus, 53 ≥ x ≥ 22,

Therefore, the minimum price to avoid the loss = $ 22

And, the minimum price to avoid the loss = $ 53

f'(x) =\frac{d}{dx}[(x-22)(53-x)] = (x-22)\frac{d}{dx} (53-x)+(53-x) \frac{d}{dx}(x-22)

⇒ f'(x) = - (x-22)+(53-x) = -x+22+53-x =-2x+75

Now, For maximum or minimum,

f'(x) = 0,

⇒ -2x+75 = 0

⇒ -2x = -75

⇒ x = 37.5

f''(x) = \frac{d}{dx}(-2x+75)=-1

For x = 37.5, f''(x) is negative,

Thus, For the price of $ 37.5 dollars the company has the greatest profit.



4 0
3 years ago
HURRY GIVING BRAINLIEST!! please help!
spin [16.1K]

Answer:

Joe wants to know how much wood is needed to make a picture frame. (3rd)

Step-by-step explanation:

4 0
3 years ago
The beginners field hockey kit costs $150 it is $15 more than three times the cost of the basic kit. What is the cost of the bas
Reptile [31]

Answer:

$45

Step-by-step explanation

150 - 15 = 135

135 / 3 = 45

7 0
3 years ago
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