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3 years ago

13

The linear function below represents Brenda's monthly cell phone bill based on the number of hours she uses. what is her hourly

rate?

1 answer:

KatRina [158]3 years ago

4 0

Answer:

for every hour used, it costs $12

Step-by-step explanation:

you can find slope by using rise over run, which would be 12/1

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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%

So

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

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%

So

$P(x$

Therefore

$P(x800)=P(x800)$

$P(x800)=0.0015 + 0.0015$

$P(x800)=0.003$

6 0

3 years ago

How to get an answer of 34 by using the following integers -1, 4, 40, and -25

umka2103 [35]

Assuming that the integers can be repeated
40-25+4+4+4+4+4-1

7 0

3 years ago

Can someone help pls?

luda_lava [24]

84 x ___ will bring 91

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3 years ago

The radius of Mars is about 3.4 times 10^3 km. What is the approximate surface area of Mars? Use the formula for the surface are

Stella [2.4K]

Answer: the answer is a hard doosie

Step-by-step explanation:

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2 years ago

What is the area of the hexagon?<br><br><br><br> 60 m 2<br> 80 m 2<br> 100 m 2<br> 120 m 2

romanna [79]

Answer:

the answer is 120m 2 that your answer.

3 0

2 years ago