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saveliy_v [14]
3 years ago
11

Pls help extra points and mark brainlist

Mathematics
1 answer:
Stolb23 [73]3 years ago
6 0

Answer:

the answers are a and d

Step-by-step explanation:

x+x+x=3x and you can't add a constant (2) to a variable(3x) so it would just be 3x+2

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A particular group of men have heights with a mean of 174 cm and a standard deviation of 6 cm. Earl had a height of 192 cm. a. W
Sati [7]

Answer:

a) 18 cm

b) 18

c) 3

The Earl's height is unusual because the  z score does not lies in the given range of usual i.e -2 and 2

Step-by-step explanation:

Given:

Mean height, μ = 174 cm

Standard deviation = 6 cm

height of Earl, x = 192 cm

a) The positive difference between Earl height and the mean = x - μ

= 192 - 174 = 18 cm

b) standard deviations is 18

c) Now,

the z score is calculated as:

z=\frac{x-\mu}{\sigma}

or

z=\frac{192-174}{6}

or

z = 3

The Earl's height is unusual because the  z score does not lies in the given range of usual i.e -2 and 2

5 0
3 years ago
A manufacturer claims that its cleaning product is best because over half of the cleaning services surveyed used the product. Wh
balu736 [363]

Answer:

D. Only one cleaning product was asked about in the survey.

Any given company can use more than one cleaning product or even use a combination of different cleaning products. The question was not specific enough, since it should have probably asked which cleaning products are used and which ones are used more frequently.

Step-by-step explanation:

the other options are wrong because:

  • A. Only 50 cleaning services were surveyed. ⇒ This actually would increase the validity of the claim because it satisfies the the condition for a valid confidence interval [np and n(1 - p) are larger than 10]-
  • B. Cleaning services were selected at random. ⇒ This actually would increase the validity of the claim.
  • C. A well-known company conducted the survey. ⇒ This actually would increase the validity of the claim.

8 0
3 years ago
50 PTS<br> Please Make sure its easy to understand
kkurt [141]

Answer:

1) -95.

2) 15.

3) The conference center is on floor 5.

Step-by-step explanation:

1) Evaluating gives -52-30-13=-(52+30+13)=-(95)=-95.

2) Substituting gives x+27=(-12)+27=15.

3) After going 4 floors down, we are on level -4. After going 9 floors up to the desired room, we are on level -4+9=5. So the conference center is on floor 5.

3 0
3 years ago
Read 2 more answers
A man has a mass of 120kg, he reduces his mass by 15%, how many kilograms is that​
Varvara68 [4.7K]

Answer:

your answer should be 102kg i could be wrong.

5 0
1 year ago
Read 2 more answers
Please help me on this! my homework is hard :(
Marat540 [252]

Answer:

a

Step-by-step explanation:

8 0
3 years ago
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