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3 years ago

NEED HELP ASAP PLEASE!! WILL MARK BRAINLIEST AND STUFF

Mathematics

1 answer:

Georgia [21]3 years ago

7 0

1.) y = 4/7x + 2

2.) y = -3/4x + 6

3.) y = 9/2x + 18

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The point R is halfway between the integers on the number line below and represents the number ____. (Use the hyphen for negativ

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-4.2

Step-by-step explanation:

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3 years ago

What is 10 times Six

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10 • 6 = 60

10 + 10 + 10 + 10 + 10 + 10

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3 years ago

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Determine the volume of a cube with sides of 30mm

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Answer: Hello, your answer would be $2.7x10^-5m^3$

Step-by-step explanation:

$30mm$

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2 years ago

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How do you convert a fraction to a decimal?

Volgvan

Answer:

To convert fractions to decimals you just divide the top by the bottom — divide the numerator by the denominator — and if the division doesn’t come out evenly, you can stop after a certain number of decimal places and round off. To convert fractions to decimals: If the fraction is a mixed number, change it to an improper fraction.

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3 years ago

A college-entrance exam is designed so that scores are normally distributed with a mean of 500 and a standard deviation of 100.

yawa3891 [41]

Answer:

The probability is 0.003

Step-by-step explanation:

We know that the average $\mu$ is:

$\mu=500$

The standard deviation $\sigma$ is:

$\sigma=100$

The Z-score is:

$Z=\frac{x-\mu}{\sigma}$

We seek to find

$P(x800)$

For P(x>800) The Z-score is:

$Z=\frac{x-\mu}{\sigma}$

$Z=\frac{800-500}{100}$

$Z=3$

The score of Z = 3 means that 800 is 3 standard deviations from the mean. Then by the rule of the 8 parts of the normal curve, the area that satisfies the conficion of 3 deviations from the mean has percentage of 0.15%

$P(x>800)=0.15\%$

For P(x<200) The Z-score is:

$Z=\frac{x-\mu}{\sigma}$

$Z=\frac{200-500}{100}$

$Z=-3$

The score of Z = -3 means that 200 is 3 standard deviations from the mean. Then by the rule of the 8 parts of the normal curve, the area that satisfies the conficion of 3 deviations from the mean has percentage of 0.15%

$P(x$

Therefore

$P(x800)=P(x800)$

$P(x800)=0.0015 + 0.0015$

$P(x800)=0.003$

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3 years ago