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2 years ago

The histogram shows the number of miles walked one weekend by people in a hiking club.

Mathematics

1 answer:

dusya [7]2 years ago

3 0

The answer is D because all the rest of the statments are untrue. d is also right because 4 people walked 3-5 miles and 3 people walked 6-8 miles and as you know, 3+4=7

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Every minute, 2.2gallons of water flows from a shower. A family of 5 people showers for an average of 9 minutes per person every

satela [25.4K]

Answer:

the whole family uses a total of 99 gallons in 1 morning

Step-by-step explanation:

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3 years ago

Please Help Will give brainliest, 5 stars and thanks!

mart [117]

Okay so 0.08L=80mL. 8,000mL=8L. 0.8L=800 mL. And 80mL=0.08L. Hope this all helps

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2 years ago

Scores on a college entrance exam are normally distributed with a mean of 550 and a standard deviation of 100. Find the value th

Alinara [238K]

Answer:

The value that represents the 90th percentile of scores is 678.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

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

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 550, \sigma = 100$

Find the value that represents the 90th percentile of scores.

This is the value of X when Z has a pvalue of 0.9. So X when Z = 1.28.

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

$1.28 = \frac{X - 550}{100}$

$X - 550 = 100*1.28$

$X = 678$

The value that represents the 90th percentile of scores is 678.

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3 years ago

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n200080 [17]

Answer:

i think they are y and (x,y)

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2 years ago

The Roosevelt Branch Library is open daily from 9:00 A.M. until 4:30 P.M., 255 days a year. How many hours in all is the library

kramer

Lets look at the hours they are open from. 9 am - 4:30 pm which is 7 and a half hours a day. Now we multiply 7 1/2 by the number of days they are open, which will be 7 1/2 * 255 = 1,912.5. This means that the library is open 1,912 1/2 hours a year.

I hope I've helped! :)

3 0

2 years ago

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