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never [62]
2 years ago
11

Suppose that 35% of students in a school can sing their national anthem correctly. The music teacher takes an SRS of 30 students

from the population of 750 students at the school and finds that 40% of students sampled can sing their national anthem correctly. The teacher plans to take more samples like this.
Let ^p represent the proportion of a sample of 30 students in the school who can sing their national anthem correctly.

What are the mean and standard deviation of the sampling distribution of ^p?
Mathematics
1 answer:
Viktor [21]2 years ago
4 0

Answer:

m^p = 0.35

o^p = \sqrt\frac{0.35(1-0.35}{30}

Step-by-step explanation:

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A circle with circumference 18 has an arc with 120 central angle
yarga [219]

Answer:

Arc length of circle with circumference 18 and an arc with a 120° central angle is:

6

Step-by-step explanation:

The arc length of a circle is given by:

Here, circumference=18

i.e. 2πr=18

and

Arc length=

Hence, Arc length of circle with circumference 18 and an arc with a 120° central angle is:6

Hope that was helpful.Thank you!

3 0
3 years ago
Find the perimeter of the triangle to the nearest unit with vertices A(-2,4) B(-2,-2) and C(4,-2) ​
astraxan [27]

Answer:

20

Step-by-step explanation:

Use the distance equation to find the length of each side:

d = √((x₂ − x₁)² + (y₂ − y₁)²)

where (x₁, y₁) and (x₂, y₂) are the points (the order doesn't matter).

AB:

d = √((-2 − (-2))² + (-2 − 4)²)

d = 6

BC:

d = √((4 − (-2))² + (-2 − (-2))²)

d = 6

AC:

d = √((-2 − 4)² + (4 − (-2))²)

d = 6√2

So the perimeter is:

AB + BC + AC

6 + 6 + 6√2

≈ 20

8 0
3 years ago
5. Omarion has % of the pages in a book
Shkiper50 [21]
0 because you never included how many pages there were total
4 0
3 years ago
A triangle has sides with lengths of 5x-7,3x-4 and 2x-6. What is the perimeter of the triangle?
boyakko [2]
The perimeter is the sum of all the sides, so P = (5x -7) + (3x-4) + (2x -6). Then group like terms so you have p = 5x + 3x + 2x -7-4-6 and end up with P = 10x - 17
7 0
3 years ago
X+x-z; use x=3 & z=4​
nadezda [96]

Answer:

2

Step-by-step explanation:

Order of operations is not as applicable in this situation because we're just dealing with addition and subtraction.  This is a simple case of plugging in values for the given expression.

x = 3

z = 4

So it becomes...

3 + 3 - 4

6 - 4

2

So with the given expression of x + x - z and the given values of x = 3 and z = 4, the expression should sum to: 2

6 0
2 years ago
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