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mihalych1998 [28]
2 years ago
13

What is 3-7/12 in a mixed number

Mathematics
1 answer:
Sidana [21]2 years ago
5 0

Answer:

3 1/2

Step-by-step explanation:

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In a study on the time that
krok68 [10]

The 95% confidence interval of the population mean, in years, is (4.3, 5.3). 4 years is not part of the confidence interval, which means that it contradicts the fact that 39% of students get their college degree in four years.

-----------------------------

To solve this question, we need to find the confidence interval for the amount of time it takes the students to get the degree.

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,which is the sample size subtracted by 1. So

df = 80 - 1 = 79

-----------------------------

95% confidence interval

Standard level of confidence, we have to find a value of T, which is found looking at the t table, with 79 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 1.9905.

-----------------------------

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 1.9905\frac{2.2}{\sqrt{80}} = 0.5

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 4.8 - 0.3 = 4.3 years.

The upper end of the interval is the sample mean added to M. So it is 4.8 + 0.3 = 5.3 years.

-----------------------------

The 95% confidence interval of the population mean, in years, is (4.3, 5.3). 4 years is not part of the confidence interval, which means that it contradicts the fact that 39% of students get their college degree in four years.

A similar question is given at brainly.com/question/24278748

6 0
2 years ago
Which product is negative
Romashka [77]
One thing for sure it is not b,d,c its a

7 0
3 years ago
Read 2 more answers
Bella is making button barrettes. She allows each of her friends to reach into er bag of buttons and randomly pick a color.
slava [35]

Answer:

Total no. of buttons = 300 + 700 + 1000

+ 500 = 2500

Possibility for a person to pick a pink button = 300/2500 = (3/25)%

Amount of pink buttons she can expect her friends to pick = 50(3/25) = 6

She can expect to make 6 pink barrettes

Step-by-step explanation:

4 0
3 years ago
Systems of elimination for<br> 2w-3q=8<br> 3w-7q=7
zlopas [31]

i guess is by multiplying 3by the first equation and multiply 2by the second equation

8 0
2 years ago
What type of relationship does this pair of angles have?
avanturin [10]

Answer:

Both add up to 180 degrees

4 0
2 years ago
Read 2 more answers
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