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3 years ago

E:

Mathematics

1 answer:

Aleks04 [339]3 years ago

6 0

Answer:

Step-by-step explanation:

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The water level in a reservoir is now 52 meters. If this was 23% increase, what was the initial depth

tester [92]

Answer:

1.23x=52

Step-by-step explanation:

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3 years ago

Help need answer and explanation

aksik [14]

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A box of pasta contains 16 ounces of pasta. If on serving weighs 1/3 ounces, how many servings are in one box of pasta

Andreyy89

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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

HELP PLS!! A study conducted by the Center for Disease Control that asked 15,000 students about their sleep habits showed that a

nexus9112 [7]

Answer:

Step-by-step explanation:

so if you have 15k and 73% and 8 hours what you need to do is do the math and do 15x8 what did you get so you have to go to the 73% what was you answer to 15x8 add that to 73 and you can do 45 in to 100

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3 years ago