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Alekssandra [29.7K]
3 years ago
9

Assume that the random variable X is normally distributed with mean μ=80 and standard deviation σ=18. Find the 11th percentile f

or X.
Mathematics
1 answer:
choli [55]3 years ago
6 0
<span>The value you are looking for is 70 - 8.4 = 61.6 Hope it helps

</span>
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A piano has 88 keys. Fifty-two of the keys are white.
Tcecarenko [31]

Answer:

36

Step-by-step explanation:

88 - 52

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22.5

Step-by-step explanation:

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Use the quadratic formula to solve the equation.–x2 + 5x = 3
Karo-lina-s [1.5K]

Given the equation - x² + 5x = 3, which can be rewritten as:

- x² + 5x - 3 = 0

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Quadratic formula:

\frac{-b\text{ }\pm\text{ }\sqrt[]{b^2\text{ - 4ac}}}{2a}

Now, we just replace the values of a, b and c on the equation above.

\frac{-5\text{ }\pm\text{ }\sqrt[]{5^2\text{ - 4(-1)(3)}}}{2(-1)}

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4 0
1 year ago
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Brilliant_brown [7]

Answer:I got 18.28

Step-by-step explanation:

so for getting the perimeter, you only need the outer line, so you sum the measurements you have for the rectangle: 1+2+2+7= 12. After that you need the circumference of the circle, you can figure it out by using the formula C = 2pi(r) You can find the radius by substracting the known sides of the rectangle attached to the circle from the bottom base and then dividing it in 2, leaving us with a radius of 2. Then we input values; C=2pi(2) which equals 4pi, but we need to divide that in half since it’s only half a circle. That leaves us with 2pi, or 6.28. Then we add the perimeter of the square, which was 12, and 6.28+12= 18.28

4 0
2 years ago
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