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NeX [460]
3 years ago
7

Help me please And thank you

Mathematics
2 answers:
irina1246 [14]3 years ago
6 0
The answer is A hopes this helps :)
valkas [14]3 years ago
4 0

Answer:

The correct option is A.

Step-by-step explanation:

Sample size(n)= 196

Sample mean = 12 ug/m³

Standard deviation (s)= 3.5 ug/m³

The formula for confidence interval is

C.I=\bar{x}\pm z^*\times \frac{s}{\sqrt{n}}

Where, \bar{x} is sample mean, s is sample standard deviation, n is sample size and z* is z-score at given confidence limit.

The value of z-score at 99.7% is 3.

C.I=12\pm 3\times \frac{3.5}{\sqrt{196}}

C.I=12\pm 0.75

C.I=[12-0.75,12+0.75]

C.I=[11.25,12.75]

The required solution is 11.25 ug/m³ - 12.75 ug/m³.

Therefore the correct option is A.

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Answer:

1. pie chart

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if you still don't understand something please ask. always happy to help :)

Step-by-step explanation:

6 0
3 years ago
A sandwich decrease from $8 to $6 what is the percentage decrease
kati45 [8]

Answer:

25%

Step-by-step explanation:

First find the difference in price= $8-$6 = $2

Now, find percentage decrease in the price of sandwich.

Percentage decrease= (difference in price/ original price) *100

                                   = \frac{2}{8} *100

                                   =\frac{200}{8}

Percentage decrease=25%

                                                   

4 0
3 years ago
Simplify (5x−2+3x^2)+(4x+3)
Art [367]

Answer:

3x^2 + 9x + 1

Or

3x ( x + 3 ) + 1

Step-by-step explanation:

(5x - 2 +3x^2 ) + (4x + 3 )

To make this a little bit more easier to read, you can remove the parentheses:

5x - 2 + 3x^2 + 4x + 3

Now, write in a way so that the like terms are next to each other:

3x^2 + 5x + 4x - 2 + 3

Now simplify the 'x' terms to get:

3x^2 + 9x - 2 + 3

Now, simplify the integers (the ones with now variables with them) to get:

3x^2 + 9x + 1

If you want, you can factor out the 3x for two of the terms to get :

3x ( x + 3 ) + 1

Therefore, your simplest form can either be 3x^2 + 9x + 1 OR 3x (x + 3 ) + 1

5 0
3 years ago
Name the quadrant in which the point (-4, -3) could be found on the coordinate plane
lesantik [10]
On the negative plane field? because everything on the - side is negative.
5 0
2 years ago
HELP BRAINLIEST FOR. CORRECT AND ALL ANSWERED ANSWER
SpyIntel [72]

Answer:

1. 6/7

2. 1/2

3. 7/10

4. 39/40

5. 15/28

6. 3/10

7. 7/12

8. 1/6

9. 5/12

10. 1/8

 Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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