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KonstantinChe [14]

3 years ago

5

Sound intensity of certain Vacuum Cleaner is a random variable having a normal distribution with a mean of 75 dB and a standard

deviation (population) of 3 db. Using p-value approach, test the null hypothesis µ = 75 against the alternative hypothesis µ ≠ 75.

1 answer:

fomenos3 years ago

8 0

Answer:

10 thousand times loud pls mark me as the brainliset hope it helps you

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yan [13]

Answer: Both 14, and 20

Step-by-step explanation:

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2 years ago

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shepuryov [24]

Answer: 4

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3 years ago

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(PLEASE HELP!!!!)Mario has money in savings. He also has a job with hourly pay. After

Olin [163]

Answer:

X = savings, p= pay per hour

X+4p = 86 - - - - (1)

X+6p=104 - - - - - (2)

Re arrange equation (1)

X=86-4p-----(3)

Substitute (3) in (2)

86-4p +6p=104

86+2p=104. (subtract 86 from both side)

2p = 18. (divide by 2 from both side)

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By substitute in equation (1)

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3 years ago

A family reunion will include a picnic. Hamburger buns come in packages of 8 and the hamburger patties come in packages of 20. H

IrinaVladis [17]

Answer:

28

Step-by-step explanation:

20+8= 28

5 0

3 years ago

What are the solutions of x² + 6x - 6 = 10?

Likurg_2 [28]

Answer: x=- 8 or x=2

Step-by-step explanation:

1. To solve this problem you can applly the quadratic formula, which is shown below:

$x=\frac{-b+/-\sqrt{b^{2}-4ac}}{2a}$

2. The quadratic equation is:

$x^{2}+6x-6-10=0\\x^{2}+6x-16=0$

3. Then:

a=1

b=6

c=-16

4. Therefore, when you substitute these values into the quadratic formula, you obtain the following result:

$x=\frac{6+/-\sqrt{6^{2}-4(1)(-16)}}{2(1)}$

$x_1=-8\\x_2=2$

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3 years ago

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