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3 years ago

Alana spent 21 dollars of her 300 dollar paycheck on a gift . What percent of her paycheck was spent on the gift

Mathematics

1 answer:

Aleksandr-060686 [28]3 years ago

4 0

7% of her paycheck was spent on the gift

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A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time student

Butoxors [25]

Answer: $(21.541,\ 23.059)$

Step-by-step explanation:

The confidence interval for population mean is given by :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

Given : Sample size : $n=240$ , which is a large sample , so we apply z-test .

Sample mean : $\overline{x}=22.3$

Standard deviation : $\sigma= 6$

Significance level : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}=1.960$

Now, a confidence interval at the 95% level of confidence will be :-

$22.3\pm(1.960)\dfrac{6}{\sqrt{240}}\\\\\approx22.3\pm0.759\\\\=(22.3-0.759,\ 22.3+0.759)\\\\=(21.541,\ 23.059)$

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3 years ago

Can you divide fractions using models which one is your favorite and why?

MakcuM [25]

Yes you can divide fractions using models here is an example

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3 years ago

What is { y= 4x+10 and y= 3x+9

Musya8 [376]

Answer:

x=-1

Step-by-step explanation:

y=4x+10

y=3x+9

-----------

4x+10=3x+9

4x-3x=9-10

x=-1

5 0

3 years ago

Read 2 more answers

What is the slope (5,7) and (2,-2)

Romashka [77]

Answer:

slope = 3

Step-by-step explanation:

to find the slope you do (y2-y1)/(x2-x1)=m

so we can plug the points into this formula

(5,7) (2,-2)

x1 y1 x2 y2

-2-7/2-5=m

-9/-3=m

Simplifies to

3=m

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3 years ago

What is the y-intercept of the function y= -1/2cos(3/2x)

Flauer [41]

Answer: (0,-1/2)

Step-by-step explanation:

Edge :-)

5 0

3 years ago