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3 years ago

A normal distribution has a mean of 50 and a standard deviation of 5 what percentage lies betwen 40 and 60

Mathematics

1 answer:

kolezko [41]3 years ago

3 0

The answer is 45% because 50-5 is 45 and that gives you the answer 45% goes in between 40 and 60. hope this helps.

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ANSWER ASAP PLEASE & SHOW UR WORK!!!

Lina20 [59]

Answer:

$x_1=\mathbf{i}\sqrt{6},\ x_2=-\mathbf{i}\sqrt{6},\ x_3=\sqrt{3},\ x_4=-\sqrt{3}$

Step-by-step explanation:

<u>Biquadratic Equations</u>

Solve:

$x^4 + 3x^2 - 18 = 0$

The biquadratic equations are equations of degree 4 without the terms of degree 1 and 3.

Solving such equations requires to express the equation as a second-degree equation with $x^2$ as the variable.

Rewriting the equation:

$(x^2)^2 + 3(x^2) - 18 = 0$

The quadratic equation can be factored as:

$(x^2+6)(x^2-3)=0$

It leads to two equations:

$x^2+6=0$

$x^2-3=0$

The first equation has imaginary roots. Solving for x:

$x^2=-6$

$x=\pm\sqrt{-6}$

$x_1=\mathbf{i}\sqrt{6}$

$x_2=-\mathbf{i}\sqrt{6}$

Where

$\mathbf{i}=\sqrt{-1}$

The second equation has two real roots:

$x^2-3=0$

$x^2=3$

$x=\pm\sqrt{3}$

$x_3=\sqrt{3}$

$x_4=-\sqrt{3}$

The roots are:

$\mathbf{x_1=\mathbf{i}\sqrt{6},\ x_2=-\mathbf{i}\sqrt{6},\ x_3=\sqrt{3},\ x_4=-\sqrt{3}}$

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3 years ago

ILL GIVE U BRAINLYIST

Amiraneli [1.4K]

B the person above me is right

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3 years ago

Write an equation that can be used to answer the question. Then solve. Round to the nearest tenth if necessary.

tensa zangetsu [6.8K]

Answer:

5^2+h^2=12^2, the answer would be ~10.97 ft.

Step-by-step explanation:

I would use the Pythagorean theorem to solve this problem. Put in the things that you know, so in this image we are given one of the legs and the hypotenuse of the triangle.

Pythagorean theorem is :

a^2+b^2=c^2 with a and b being the legs and c being the hypotenuse.

Once you plug in the hypotenuse and one of the legs, solve for the other leg by subtracting a^2 (5^2) from 12^2 (c^2), which will give you 119, and then take the square root of 119 and you will get your answer.

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3 years ago

I NEED HELP BAD MATH ASAP

nexus9112 [7]

69.75 - 64.85 = 4.90 or better yet 4.9

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3 years ago

How do you solve number 13(the last one)

N76 [4]

Lets say that variable x=total number of hotdogs, and variable y=total number of drinks. Our first equation will calculate the total cost.
2x+1y=11. We are multiplying the price by the total number of each item then adding them together, since they spent a total of $11. Our second equation will calculate the number of items.
x+y=8.
To solve, we will isolate x in the second equation. x=8-y We will substitute that for x in the first equation. 2(8-y)+1y=11 Distributive property. 16-2y+1y=11 Combine like terms. 16-y=11 Isolate y to solve. y=5 Then we plug y into the second equation and solve for x. x+5=8 Subtract 5 from both sides. x=3

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3 years ago