2 years ago

The product of 2x^3 and 6x^5 is

Mathematics

1 answer:

Butoxors [25]2 years ago

3 0

12x^8 multiply the leading terms (2and 6) then add exponents (5and3)

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SCCoast, an Internet provider in the Southeast, developed the following frequency distribution on the age of Internet users. Fin

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Answer:

Mean: 40.17 years.

Standard deviation: 10.97 years.

Step-by-step explanation:

The frequency distribution is in the attached image.

We can calculate the mean adding the multiplication of midpoints of each class and frequency, and dividing by the sample size.

The midpoints of a class is calculated as the average of the bounds of the class.

Then, the mean can be written as:

$E(X)=\dfrac{1}{N}\sum f_iX_i\\\\\\E(X)=\dfrac{1}{60}(3\cdot15+7\cdot25+18\cdot35+20\cdot45+12\cdot 55)=\dfrac{45+175+630+900+660}{60}\\\\\\E(X)=\dfrac{2,410}{60}=40.17$

The standard deviation can be calculated as:

$s=\sqrt{\dfrac{1}{N-1}\sum f_i(X_i-E(X))^2}\\\\\\s=\sqrt{\dfrac{1}{59}[3(15-40.17)^2+7(25-40.17)^2+18(35-40.17)^2+20(45-40.17)^2+12(55-40.17)^2]}$

$\\\\\\s=\sqrt{\dfrac{1}{59}( 1,900.59 + 1,610.90 + 481.12 + 466.58 + 2,639.15 )}\\\\\\s=\sqrt{\dfrac{ 7,098.33 }{59}}=\sqrt{120}=10.97$

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2 years ago

Cool Tees buys a shirt for $21. The sale price is120% of the original price. What is the sale price for this shirt?

GarryVolchara [31]

Answer:

divide 21 by 12 then multiply by 10 = $17.5

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2 years ago

The dry cleaning fee for 3 pairs of pants is $18. what is the constant of proportionality

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Every pair of pants would cost 18/3 dollars

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Sam spent the day at the mall. First, he bought three mules for $30

Dmitriy789 [7]

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Step-by-step explanation:

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Murrr4er [49]

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229.7

Step-by-step explanation:

8 * 1/2 * 5.8 * 7 * sqrt(2.)

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