3 years ago

I will mark you brainlist!

Mathematics

1 answer:

stepan [7]3 years ago

5 0

Answer:

15 times

Step-by-step explanation:

6 green erasers / 20 total erasers =0.3

0.3(50) = 15

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Scores from an exam are normally distributed with a mean of 85 and a standard deviation of 5. Suppose 188 students take the exam

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

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Step-by-step explanation:

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3 years ago

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Which of these numbers is divisible by 8,,, 7116 4309 ,,,4136,,, 9406

Nikolay [14]

4136/8= 517

The others
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When plotted on a grid, the paths between four neighborhood houses form the shape of a kite as shown.

KatRina [158]

Answer:

The area of the figure is 1,000 square feet

Step-by-step explanation:

we know that

The area of the kite ABCD

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$A=\frac{1}{2}[AC*BD]$

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4 years ago

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jolli1 [7]

Answer:

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Step-by-step explanation:

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