<img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7B4%7D%20%2816%20%2B%204p%29%20%3D%20" id="TexFormula1" title=" \frac{1}{4}

2 years ago

(16 + 4p) = " alt=" \frac{1}{4} (16 + 4p) = " align="absmiddle" class="latex-formula">

1 answer:

7 0

Hopefully this helps :D

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charle [14.2K]

The mean is $\mu=85$ and standard deviation is $\sigma=5$ . Then the variable $X\sim N(85,5)$ .

Use substitution $Z=\dfrac{X-\mu}{\sigma}=\dfrac{X-85}{5}$ , then the variable $Z\sim N(0,1)$ .

The probability $Pr(X>80)$ can be calculated in the following way:

for X=80, $Z=\dfrac{80-85}{5} =-1$ and $Pr(X>80)=Pr(Z>-1)$ . From the diagram $Pr(Z>-1)=0.34+0.34+0.135+0.025=0.84$ .

Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80

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DerKrebs [107]

Answer:

yes

Step-by-step explanation:

nothing much u have to do like what ur teacher said

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worty [1.4K]

The is will be -11b3 - 16b2 + 4b + 3

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zaharov [31]

the answer of this equation is -5

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ElenaW [278]

Answer: 19t +100

Step-by-step explanation:

19t +100 where t is the number of hours she worked and the extra 100 dollars is the money she got from her friend.

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3 years ago