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Lubov Fominskaja [6]
3 years ago
5

I will give 20 points and Brainliest for one question if someone gives an explanation and the answer!!!! PLs help me, and hurry:

(

Mathematics
2 answers:
SIZIF [17.4K]3 years ago
4 0

100+x+C=49+4x+c


51=3x


x=\frac{51}{3}


x=17


CHECK:


C=C


180-(100+x)=180-(4x+49)


180-(100+17)=180-(4(17)+49))


180-117=180-117


63=63  CHECKS



Sever21 [200]3 years ago
3 0

100+x+C=49+4x+c

51=3x

x=\frac{51}{3}

x=17

CHECK:

C=C

180-(100+x)=180-(4x+49)

180-(100+17)=180-(4(17)+49))

180-117=180-117

63=63  CHECKS

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Find the experimental probability that only 2
Nitella [24]

The experimental probability that only 2 of 4 children in a family are boys is <u>50%</u>.

<h3>What is experimental probability?</h3>

Experimental probability refers to the chance of an expected success being achieved in a series of experiments conducted.

Experimental probability is the number of times that the expected success occurs as a fraction of the total number of times the experiment was conducted.

Like all probabilities, the experimental probability is based on the likelihood that what the experimenter expects is achieved.

Expected number of boys = 2

The number of children in the family = 4

Experimental probability = 50% (2/4 x 100)

Thus, we can conclude, based on the experimental probability, that <u>50%</u> (or 2) of the 4 children in the family are boys.

Learn more about experimental probabilities at brainly.com/question/8652467

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1 year ago
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A stadium's normal ticket price is $78. As a special promotion they offer 15% off. What is the price of the discounted ticket?
meriva
You have to find out what 15% of $78 dollars is.  If you have to do this in your head and not on a calculator you can find 10%, then cut that number in 1/2 and add it to the answer.  So 10% of $78 is 7.8 so $7.80.  You can divide 7.80 by 2 and get 3.9 and add that to 7.8 which is 11.70.  So 15% of $78 is $11.70. 
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Assume the general population gets an average of 7 hours of sleep per night. You randomly select 45 college students and survey
tekilochka [14]

Answer:

a) ii. This is a left-tailed test.

b) -1.59

c) -1.301

d) i. reject null hypothesis

e) Option i) The data supports the claim that college students get less sleep than the general population.

Step-by-step explanation:

We are given the following in the question:  

Population mean, μ = 7 hours

Sample mean, \bar{x} = 6.87 hours

Sample size, n = 45

Alpha, α = 0.10

Sample standard deviation, s =  0.55 hours

First, we design the null and the alternate hypothesis

H_{0}: \mu = 7\text{ hours}\\H_A: \mu < 7\text{ hours}

a) We use one-tailed(left) t test to perform this hypothesis.

b) Formula:

t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }

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t_{stat} = \displaystyle\frac{6.87 - 7}{\frac{0.55}{\sqrt{45}} } =-1.59

c) Now,

t_{critical} \text{ at 0.10 level of significance, 44 degree of freedom } = -1.301

Since,                    

t_{stat} < t_{critical}

d) We fail to accept the null hypothesis and reject it.

We accept the alternate hypothesis and conclude that  mean number of hours of sleep for all college students is less than 7 hours.

e) Option i) The data supports the claim that college students get less sleep than the general population.

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How to write 899,501 in expanded form
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Easy. If 1 In. = 2.54 Cm. then the equation would be 47 * 2.54 = 119.38.
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