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sergey [27]
3 years ago
14

Donna read 18 out of 30 pages in her book.What percent of the book did she read?​

Mathematics
2 answers:
inysia [295]3 years ago
6 0

Answer:

60

Step-by-step explanation:

18 /30 is .6. So the answer would be 60 percent

bazaltina [42]3 years ago
6 0

Answer:

60%

Step-by-step explanation:

1.Divide 18 and 30 by 3

  • 6 and 10

2. Multiply each number by 10

  • 60 and 100

3.Put it as a fraction

  • \frac{60}{100}=0.6=<u>60%</u>

<u></u>

<u>Hope this helped! :)</u>

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The breaking strength of a cable is assumed to be lognormally distributed with a mean of 75 and standard deviation of 20. • If t
son4ous [18]

Answer:

If the load of magnitude 50 is hung from the cable, determine the probability of failure of the cable?

There is a 10.56% probability of failure of the cable.

If the load can take values 30, 50, and 70 with probabilities 0.2, 0.35, and 0.45 respectively, determine the probability of failure of the cable?

There is a 15.87% probability of failure of the cable.

Step-by-step explanation:

Problems of normally distributed samples can be 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:

The breaking strength of a cable is assumed to be lognormally distributed with a mean of 75 and standard deviation of 20. This means that \mu = 75, \sigma = 20.

If the load of magnitude 50 is hung from the cable, determine the probability of failure of the cable?

This is the pvalue of Z when X = 50.

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

Z = \frac{50 - 75}{20}

Z = -1.25

Z = -1.25 has a pvalue of 0.1056.

There is a 10.56% probability of failure of the cable.

If the load can take values 30, 50, and 70 with probabilities 0.2, 0.35, and 0.45 respectively, determine the probability of failure of the cable?

Now we have that

X = 0.2(30) + 0.35(50) + 0.45(70) = 55

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

Z = \frac{55 - 75}{20}

Z = -1

Z = -1 has a pvalue of 0.1587.

There is a 15.87% probability of failure of the cable.

3 0
3 years ago
Help me with geometry plzzzzzzzzzzzzzzzzzzzz
Natalija [7]

Answer:

x = 17

Step-by-step explanation:

A triangle's sum is 180 degrees, hence

6x + 10 + x + 17 + 4x - 34 = 180.

11x + 10 + 17 - 34 = 180

11x - 7 = 180

11x = 187

x = 17

hope this helps and is right!! p.s. i really need brainliest :)

3 0
2 years ago
Read 2 more answers
You want to build a fence around a square garden that covers 506.25 square feet. How many feet of fence will you need to complet
Stolb23 [73]
<span>The area of a square is (length of side)^2 , the perimeter of a square is 4*(length of side) 

Then your answer is 4 * sq rt (506.25 f`t^2) = 4 * 22.5 ft = 

= 90 ft of fence</span><span>Source(s):</span>
4 0
3 years ago
Read 2 more answers
What is pythagoras triplets?
dedylja [7]
A pythagoras triplet is a set of three numbers ... not just any three numbers,
but a set where the (square of one of them) is the sum of the (squares of the
other two). 

If they're related in that way, then they can be the lengths of the sides of a
right triangle.

If they're not, then they can't.
5 0
3 years ago
I need help with this question
goldenfox [79]
Take a picture of your work and send it so I can help you
3 0
2 years ago
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