3 years ago

What digit is in the hundreds place of 39, 487?

1 answer:

never [62]3 years ago

6 0

Answer:

Step-by-step explanation:

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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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4 years ago

s2008m [1.1K]

Answer:

B and C

Step-by-step explanation:

It has different angles and an obtuse angle.

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Elena-2011 [213]

Twelve balls are in the bag

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Troyanec [42]

The answer is 91 ............

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3 years ago

sergeinik [125]

Answer: 26

Step-by-step explanation:

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3 years ago