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Olin [163]
3 years ago
12

Someone please help!!!

Mathematics
1 answer:
djyliett [7]3 years ago
5 0
#3.  the probability of spinning "rock" is 25% or 1/4  so we can use this probability to predict the number of times we would expect to get "rock" in 80 spins as follows:
25% of 80 = .25(80) = 20  So how likely is it we spin 20 'rock' out of 80 spins?  At 25%, not very likely..

#4. 
A.  True
B.  True
C.  False, the theoretical probability of make make using the spinner is 
\frac{3}{4} ( \frac{3}{4)} = \frac{9}{16} or about 56%
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Ive labeled the ordered pairs but what does it mean by state the quadrant or axis in/on which the point is located
irina1246 [14]

So the image below shows what quadrants are. From the top-right square, the order of quadrants goes from 1-4 in a counter-clockwise matter.

Quadrant I: Top-right square

Quadrant II: Top-left square

Quadrant III: Bottom-left square

Quadrant IV: Bottom-right square.

Any points that are on the bolded vertical line are on the y-axis, and any points on the bolded horizontal line is on the x-axis.

6 0
3 years ago
What is the answer too 2y-3=-5
bogdanovich [222]

2 − 3 = −5

First we need to Add 3 to both sides of the equation:

2 − 3 + 3 = −5 + 3

Then we simplify:

2 = −5 + 3

 2 = −2

Now we divide both sides of the equation by the same term:

2 / 2 = −2 / 2

Final answer: = −1

I hope this helps!

8 0
3 years ago
Read 2 more answers
Solve for x. 5x^2 – 45 = 0
mamaluj [8]

5x^2-45=0

<em>*Add 45 to both sides*</em>

5x^2=45

<em>*Divide both sides by 5*</em>

x^2=9

<em>*Take the square root of both sides*</em>

x=+/-9

Hope this helps!!

3 0
4 years ago
Read 2 more answers
10.A noted psychic was tested for ESP. The psychic was presented with 200 cards face down and askedto determine if the card was
lions [1.4K]

Answer:

Step-by-step explanation:

The sample proportion \hat p = \dfrac{50}{200}

\hat p = 0.25

The null hypothesis and the alternative hypothesis:

H_o: p = 0.20  \\ \\  H_1 : p > 0.20

Thus; the test statistics is:

Z = \dfrac{\hat p - p_o}{\dfrac{p_o(1-p_o)}{n} }

Z = \dfrac{0.25 -0.20}{\sqrt{\dfrac{0.20(1-0.20)}{200} }}

Z = \dfrac{0.05}{\sqrt{\dfrac{0.16}{200} }}

Z = \dfrac{0.05}{\sqrt{0.0008 }}

Z = 1.768

P-value = 2 × P(Z< - 1.768)

From the z tables

P-value = 2 × 0.03853

P-value = 0.07706

Thus, the p-value is 0.05 < P-value < 0.10

8 0
3 years ago
What is 7/8 divided by 1/8
eduard

Answer:

7

Step-by-step explanation:

<u>Concepts:</u>

  • Division: a system of distributing a collection of things into equal parts
  • Fractions: #s that represent a part of a whole
  • Dividing Fractions: dividing a fraction by another fraction = multiplying the fraction by the inverse (reciprocal) of the other one
  • Inverse Operations: operations that are opposite of each other (e.g. inverse of addition is subtraction)

<u>Solving:</u>

1. First, let's set up the equation:

7/8 ÷ 1/8

2. We can get the reciprocal of 1/8 by doing the opposite of division; multiplication. 1/8 becomes 1 · 8, and that's equal to 8.

3. Now, since we know dividing a fraction by another one is exactly the same as multiplying the fraction by the reciprocal of the other, let's multiply 7/8 by the inverse of 1/8, which is 8.

7/8 · 8 = 56/8 = 7

Therefore, 7/8 divided by 1/8 is equal to <u>7</u>.

8 0
3 years ago
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