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Shkiper50 [21]
3 years ago
6

BRAINLIESTTTTTT PLEASEEEEEE

Mathematics
2 answers:
Bingel [31]3 years ago
7 0
The final exams have the smaller IQR
Olenka [21]3 years ago
4 0
To find interquartile range, you have to find quartile 1 and quartile 3. Then, you subtract to two to find interquartile range. To solve this problem, I first found quartile 1 and quartile 3 which are 80 and 92, respectively. Then I subtracted 80 from 92 which got me the interquartile range for the midterm data. Then, to find the interquartile range for the finals data, I did the same thing and I got 78 and 85 which gave me an interquartile range of 7. So, for the answer, I got c. the final exams.
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How do you write 21% as a decimal
Goshia [24]

Answer:

0.21

Step-by-step explanation:

if you write it as a fraction it would be 21/100

and if that is made to a decimal it would be 0.21 .

8 0
3 years ago
Read 2 more answers
Multiply (9x + 2) (2x - 3). What is the product?
garik1379 [7]

Answer:

18x^2-23x-6

Step-by-step explanation:

multiply: 9x*2x-9x*3+2*2x-2*3

18x^2-9X(3)3+2(2X)-2(3)

18X^2-27x+4x-6

18x^2-23x-6

7 0
3 years ago
In the past, 21% of all homes with a stay-at-home parent, the father is the stay-at-home parent. An independent research firm ha
Afina-wow [57]

Answer:

A sample size of 79 is needed.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

\pi = 0.21

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.  

What sample size is needed if the research firm's goal is to estimate the current proportion of homes with a stay-at-home parent in which the father is the stay-at-home parent with a margin of error of 0.09?

A sample size of n is needed.

n is found when M = 0.09. So

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.09 = 1.96\sqrt{\frac{0.21*0.79}{n}}

0.09\sqrt{n} = 1.96\sqrt{0.21*0.79}

\sqrt{n} = \frac{1.96\sqrt{0.21*0.79}}{0.09}

(\sqrt{n})^{2} = (\frac{1.96\sqrt{0.21*0.79}}{0.09})^{2}

n = 78.68

Rounding up to the nearest whole number.

A sample size of 79 is needed.

4 0
3 years ago
Find the domain of the rational function 9x/(x+5)(x+3)
xenn [34]

Answer:

the domain is : D = ]-∞ , -5[ U ]-5 , -3[ U ]-3 , +∞[

Step-by-step explanation:

hello :

f(x) = 9x/(x+5)(x+3)

f exist for : (x+5)(x+3) ≠ 0

(x+5)(x+3)=0

x+5=0 or x+3=0  means : x= - 5 or x= -3

the domain is : D = ]-∞ , -5[ U ]-5 , -3[ U ]-3 , +∞[

7 0
3 years ago
Beth is taking pictures outdoors during the evening. She knows that the later it is when she takes a picture, the longer her cam
Sunny_sXe [5.5K]

Answer:

c. how late it is in the evening is a function of the length of time the shutter needs to stay open.

3 0
2 years ago
Read 2 more answers
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