2 years ago

Please help!!!!!!!!!

Mathematics

1 answer:

vichka [17]2 years ago

3 0

Answer:

Step-by-step explanation:

I used a graph to figure this out, so I just know it's correct.

a=1 b=-6 c=8 when added together because the b=NEGATIVE 6, this all =3

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

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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 $Pr(Z>-1)=0.34+0.34+0.135+0.025=0.84$ .

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Step-by-step explanation:

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2 years ago

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Andreyy89

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