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3 years ago

15

In a huge chess tournament, 45 matches were played. Find out how many people were involved if it is known that each participant

played one game with every other participant in the tournament.

1 answer:

gtnhenbr [62]3 years ago

3 0

There was 45 combinations of 2 so

xC2 = 45 where x = number of players

10C2 = (10*9) / 2 = 45

So there were 10 players involved

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How many boxes of markers must be sold for the company’s income to equal the cost of production

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C. 200

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2 years ago

A quality control expert at LIFE batteries wants to test their new batteries. The design engineer claims they have a variance of

emmainna [20.7K]

Answer:

$z = \frac{981.7 -997}{\frac{62}{\sqrt{73}}}= -2.108$

And we can use the normal standard distribution table or excel and with the complement ruler we got:

$P(z>-2.108) =1- P(z$

Step-by-step explanation:

We know the following info given:

$\mu = 997$ represent the true mean

$\sigma = \sqrt{3844}= 62$ represent the population deviation

$n = 73$ represent the sample size selected

Since the sample size is large enough (n>30) we can use the central limit theorem and the sample mean would have the following distribution:

$\bar X \sim N (\mu, \frac{\sigma}{\sqrt{n}})$

And for this case we want to find this probability:

$P(\bar X >981.7)$

And we can use the z score formula given by:

$z= \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}$

And replacing we got:

$z = \frac{981.7 -997}{\frac{62}{\sqrt{73}}}= -2.108$

And we can use the normal standard distribution table or excel and with the complement ruler we got:

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3 years ago

Question 2<br> Which of the following is not shown on the scatter plot below?

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Answer:

Step-by-step explanation:

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3 years ago

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2 years ago

Will mark BRAINLIEST!! — Point H is the circumcenter of triangle DEF. Which must be true? Check ALL that apply. See image.

Margarita [4]

Answer:

A, C, F

Step-by-step explanation:

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3 years ago