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stepan [7]
3 years ago
10

Salim has a flock of 300 chickens, 15% of which are infected with a virus. He plans on taking an SRS of 7

Mathematics
1 answer:
Nookie1986 [14]3 years ago
6 0

Answer:

(7/4)(0.15)^4(0.85)^3

Step-by-step explanation:

khan says it’s right

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zavuch27 [327]
172,000 is the answer I think
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3 years ago
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Andre has $ 90 dollars to spend on sneakers. This is 75% of the cost of the sneakers. How much more will the need? Solve and exp
goldenfox [79]

Answer:

I suppose the answer would be 120

Step-by-step explanation:

Well if 90 is 75% then 50% should be 60 and 25% should be 30.

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7 0
3 years ago
Scores on a test are normally distributed with a mean of 81.2 and a standard deviation of 3.6. What is the probability of a rand
Misha Larkins [42]

<u>Answer:</u>

The probability of a randomly selected student scoring in between 77.6 and 88.4 is 0.8185.

<u>Solution:</u>

Given, Scores on a test are normally distributed with a mean of 81.2  

And a standard deviation of 3.6.  

We have to find What is the probability of a randomly selected student scoring between 77.6 and 88.4?

For that we are going to subtract probability of getting more than 88.4 from probability of getting more than 77.6  

Now probability of getting more than 88.4 = 1 - area of z – score of 88.4

\mathrm{Now}, \mathrm{z}-\mathrm{score}=\frac{88.4-\mathrm{mean}}{\text {standard deviation}}=\frac{88.4-81.2}{3.6}=\frac{7.2}{3.6}=2

So, probability of getting more than 88.4 = 1 – area of z- score(2)

= 1 – 0.9772 [using z table values]

= 0.0228.

Now probability of getting more than 77.6 = 1 - area of z – score of 77.6

\mathrm{Now}, \mathrm{z}-\text { score }=\frac{77.6-\text { mean }}{\text { standard deviation }}=\frac{77.6-81.2}{3.6}=\frac{-3.6}{3.6}=-1

So, probability of getting more than 77.6 = 1 – area of z- score(-1)

= 1 – 0.1587 [Using z table values]

= 0.8413

Now, probability of getting in between 77.6 and 88.4 = 0.8413 – 0.0228 = 0.8185

Hence, the probability of a randomly selected student getting in between 77.6 and 88.4 is 0.8185.

4 0
3 years ago
4(5+6) helpppppppp :((((
Anna007 [38]
5+6= 11 times 4 is 44
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3 years ago
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How do you answer this for a elimination simulatoneons equation
denis23 [38]

\it 3x+2y=14&#10;\\&#10;5x-2y=18&#10;\\&#10;------\\&#10;8x \ \ \ \ \ \ \  =32 \Rightarrow x = 32:8\Rightarrow x=4 \ \ \ (*)

\it 3x+2y=14 \stackrel{(*)}{\Longrightarrow} 3\cdot4+2y=14 \Rightarrow 12+2y=14 \Rightarrow 2y=14-12\Rightarrow &#10;\\\;\\&#10;\Rightarrow 2y=2 \Rightarrow y=2:2 \Rightarrow y=1

Therefore, the solution is:  x = 4,  y=1.


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3 years ago
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