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2 years ago

If y varies directly as x, and y is 6 when x is 72, what is the value of y when x is 8?

Mathematics

1 answer:

Licemer1 [7]2 years ago

3 0

Answer:

Y=2/3

Step-by-step explanation:

Y varies directly as X

Y=k x

K is a constant

6=k72

K=1/12

Y=1/12x

Y=1/12×8

y=2/3

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nasty-shy [4]

Answer:

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Step-by-step explanation:

28 divided by 40 is 0.7 which equals 70 percent.

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2 years ago

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DochEvi [55]

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2 years ago

50 POINTS!!!!

Softa [21]

Answer:

Step-by-step explanation:

Given that X - the distribution of heights of male pilots is approximately normal, with a mean of 72.6 inches and a standard deviation of 2.7 inches.

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We have to find the percentile

X = 74.2

Corresponding Z score = 74.2-72.6 = 1.6

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1 year ago

A marketing firm is asked to estimate the percent of existing customers who would purchase a "digital upgrade" to their basic ca

Ugo [173]

Answer: A. 664

Step-by-step explanation:

Given : A marketing firm is asked to estimate the percent of existing customers who would purchase a "digital upgrade" to their basic cable TV service.

But there is no information regarding the population proportion is mentioned.

Formula to find the samples size , if the prior estimate to the population proportion is unknown :

$n=0.25(\dfrac{z*}{E})^2$

, where E = Margin of error.

z* = Two -tailed critical z-value

We know that critical value for 99% confidence interval = $z*=2.576$ [By z-table]

Margin of error = 0.05

Then, the minimum sample size would become :

$n=0.25(\dfrac{2.576}{0.05})^2$

Simplify,

$n=0.25\times2654.3104=663.5776\approx664$

Thus, the required sample size= 664

Hence, the correct answer is A. 664.

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3 years ago

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trasher [3.6K]

Answer:

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Step-by-step explanation:

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2 years ago