3 years ago

Please hurry! Marking brainliest!

Mathematics

2 answers:

Novay_Z [31]3 years ago

7 0

The answer to this is D

NeX [460]3 years ago

3 0

Sorry we need more information

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Each notebook contains 60 sheets of paper. Andre has 5 notebooks. If the equation is y=5x60 then what does y stand for?

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Answer:

y = the total sheets in all 5 notebooks

Step-by-step explanation:

5 = notebooks

60 = sheets

y = the total

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What is the solution

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2 years ago

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

Tomtit [17]

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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3 years ago

Simplify the following equation. (6x+4)+(5-2x)

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Answer:

x= -9/4=-2.25

Step-by-step explanation:

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There is a positive correlation between the number of times the Striped Ground Cricket chirps per second and the temperature in

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This answer is c 190

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