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2 years ago

2) Orion buys 3 books for a total of $25.50. He pays $8 plus sales tax for each book. He wants

1 answer:

7 0

Answer: I think the Sales tax is 0.5 because 0.5 X 3 is 1.5, He paid $24 in total for the books so you would do 24 + 1.5 and get 25.50, So it would have to be 0.5 sales tax for one book. Sorry about my English.

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A forestry researcher wants to estimate the average height of trees in a forest near Atlanta, Georgia. She takes a random sample

marusya05 [52]

Answer:

The margin of error for her confdence interval is of 0.3757.

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 = 18 - 1 = 17

99% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 17 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.99}{2} = 0.995$ . So we have T = 2.8982

The margin of error is:

$M = T\frac{s}{\sqrt{n}}$

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

Standard deviation of 0.55 meters.

This means that $s = 0.55$

What is the margin of error for her 99% confidence interval?

$M = T\frac{s}{\sqrt{n}}$

$M = 2.8982\frac{0.55}{\sqrt{18}}$

$M = 0.3757$

The margin of error for her confdence interval is of 0.3757.

7 0

3 years ago

THIS IS DUE TODAY HELP PLEASE!!!

lozanna [386]

This seems like a personal question

5 0

3 years ago

Find the percent of decrease from 240 to 120. Round to the nearest tenth of a percent, if necessary.

KiRa [710]

the difference from 240 to 120 is 50%

3 0

3 years ago

What is the sum? (1/x+2)+(1/x+3)+(1/X^2+5+6)

PolarNik [594]

For this case we have the following expression:
(1 / x + 2) + (1 / x + 3) + (1 / X ^ 2 + 5 + 6)
Rewriting we have:
(1 / x + 2) + (1 / x + 3) + (1 / ((x + 2) * (x + 3)))
By doing common factor we have:
(1 / ((x + 2) * (x + 3))) * (x + 3 + x + 2 + 1)
Rewriting:
(1 / ((x + 2) * (x + 3))) * (2x + 6)
The sum is:
((2x + 6) / ((x + 2) * (x + 3)))
Answer:
((2x + 6) / ((x + 2) * (x + 3)))

7 0

3 years ago

Can someone please help me please

jeka94

Answer:56

Step-by-step explanation: math

4 0

3 years ago