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Sergeu [11.5K]
3 years ago
13

Suppose that for a randomly selected high school student who has taken a college entrance exam, the probability of scoring above

650 is 0.30. A random sample of n = 10 students was selected. The mean μ of X, the number of students in the sample who have scores above 650 is ______.
Mathematics
1 answer:
Sophie [7]3 years ago
5 0

Answer:

3.0

Step-by-step explanation:

n=10

p=0.30

mean=np=10X0.3 = 3

That is it.

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A bag of potato chips is packaged at sea level (1.00 atm) and has
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Answer:

406 ml

Step-by-step explanation:

P1V1 = P2V2

(1) (.315) = (.775)(V2)

V2 = .406

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2 years ago
What is the length of the line segment with endpoints (8,−10) and (8, 20) ?
Gwar [14]
B is your answer because 20 - -10 is 10 brainliest please
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3 years ago
A satellite dish is shaped like a paraboloid of revolution. The signals that emanate from a satellite strike the surface of the
allochka39001 [22]

Answer:

The receiver must be placed at a distance of 6.125 ft from the center.

Step-by-step explanation:

The dish is of parabola shape with the length of 14 feet and 2 feet deep from the center.

A parabola is a curve which is a set of all points in the plane which are at equal distance away from a given point called focus and given line called directrix.

We have to find out the point at which all the waves comes to one point where the receiver must be placed is the focus of the parabola.

The above scenario is shown in the image which can be converted in mathematical graphical representation of the parabolic curve.

The extreme two end points becomes, (-7,2) and (7,2)

The general equation for such parabola is:

x² = 4ay

where, a is the distance from the center and the focus.

Since, (7,2) satisfy the equation so,

7² = 4a×2

a = 49 /8

Thus,

<u>The receiver must be placed at a distance of 6.125 ft from the center.</u>

5 0
3 years ago
6)a garden was square, but last year she made it makes or shortening one side 5 meters and the other 8 meters. If the area of th
Alekssandra [29.7K]

Answer:

let dimention of original garden be x

then (x-8)(x-5) = 180

x^2 -13x -140 = 0

(x-20)(x+7)=0

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x = 20

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2 years ago
Find the Area of the Shaded Region.
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Answer:

42cm×22 =...............

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