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Dmitriy789 [7]
3 years ago
14

Help with these 4 30 points NEED TO BE DONE BEFORE TOMORROW

Mathematics
2 answers:
Vladimir79 [104]3 years ago
4 0

1 is 96 because you must do the inverted T

7nadin3 [17]3 years ago
3 0
Number 4 is c, she basically did it the second way you could do it

2. one way is divide 15 on each sides and then the other way is to multiply 1/15 on both sides
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The average natural gas bill for a random sample of 21 homes in the 19808 zip code during the month of February was $311.90 with
Serhud [2]

Answer:

The 90% confidence interval for the true mean natural gas bill for homes in the 19808 zip code area in February is between $292.48 and $331.32

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 21 - 1 = 20

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 20 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 1.7247

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 1.7247\frac{51.60}{\sqrt{21}} = 19.42

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 311.9 - 19.42 = $292.48

The upper end of the interval is the sample mean added to M. So it is 311.9 + 19.42 = $331.32

The 90% confidence interval for the true mean natural gas bill for homes in the 19808 zip code area in February is between $292.48 and $331.32

3 0
2 years ago
Please help how to find the value of x and find the length of segment AD, the value is 5 I just need to show my work.
alexdok [17]

Answer:

9. x = 5

10. AD = 7

Step-by-step explanation:

As shown in the diagram, BD is a perpendicular bisector. And D is a point on the perpendicular bisector, meaning it is equidistant from the endpoints on the segment(points A and C). Because of this, we can say AD = CD.

We can substitute to get:

2x - 3 = x + 2

And simplify and solve:

x - 3 = 2

x = 5

AD is just 2x - 3, so we can substitute in x to find AD:

AD = 2(5) -3

AD = 10 - 3

AD = 7

5 0
2 years ago
Asap
Schach [20]

Answer:

(14 + 4)c, or 18c

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
What value of n makes the equation true? -2n + 1.8 =3.2
stich3 [128]

Answer:

-0.7

Step-by-step explanation:

-2n+1.8=3.2

-2n=3.2-1.8

-2n=1.4

n=1.4/-2

n=-0.7

4 0
3 years ago
M+5n=7 how to solve equation
aivan3 [116]
M + 5n = 7
subtract 5n from each side

m = -5n + 7
7 0
3 years ago
Read 2 more answers
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