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natta225 [31]
3 years ago
10

10 students are standing equidistant from the center of a classroom. they are all holding hands to begin with. they must go and

shake hands with all other students whose hands they are not holding. no handshake will occur more than once. how many handshakes will take place? ​
Mathematics
2 answers:
ozzi3 years ago
4 0

Answer:

35

Step-by-step explanation:

i dont know how to explain how i got the anwser

Alja [10]3 years ago
4 0

Answer:

45 handshakes will take place in total in the party

Step-by-step explanation:

Total number of students who attended the party = 10

Number of students needed to make one handshake = 2

Given that : no handshake will occur more than once.

⇒ No repetition of handshakes will be there.\

We need to find the total number of handshakes that took place in the party

\implies\text{Total number of handshakes = }_2^{10}\txterm{C}

\implies\text{Total number of handshakes = }\frac{10!}{2!\times 8!}

\implies\text{Total number of handshakes = }\frac{10\times 9}{2}

\implies\text{Total number of handshakes = }45

Therefore, 45 handshakes will take place in total in the party

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Step-by-step explanation:

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Answer:

B: 280

Step-by-step explanation:

The regression line predicts that when x equals 5:

log_{10}(y) = 2.447

In order to find the value for y, one must simply apply the following logarithmic property:

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The defect length of a corrosion defect in a pressurized steel pipe is normally distributed with mean value 30 mm and standard d
skelet666 [1.2K]

Answer:

z=-0.842

And if we solve for a we got

a=30 -0.842*7.8=23.432

So the value of height that separates the bottom 20% of data from the top 80% is 23.432.  

Step-by-step explanation:

Let X the random variable that represent the heights of a population, and for this case we know the distribution for X is given by:

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For this part we want to find a value a, such that we satisfy this condition:

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P(X   (b)

As we can see on the figure attached the z value that satisfy the condition with 0.20 of the area on the left and 0.80 of the area on the right it's z=-0.842

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P(z

But we know which value of z satisfy the previous equation so then we can do this:

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And if we solve for a we got

a=30 -0.842*7.8=23.432

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