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Sergio039 [100]
3 years ago
15

The 2015 American Time Use survey contains data on how many minutes of sleep per night each of 10,900 survey participants estima

ted they get. The times follow the Normal distribution with mean 529.9 minutes and standard deviation 135.6 minutes. An SRS of 100 of the participants has a mean time of x¯=514.4 minutes. A second SRS of size 100 has mean x¯=539.3 minutes. After many SRSs, the values of the sample mean x¯ follow the Normal distribution with mean 529.9 minutes and standard deviation 13.56 minutes.(a) What is the population?A. The population is 135.6 million respondents to the American Time Use Survey.B. The population is the 100 participants in the SRS.C. The population is the 10,900 respondents to the American Time Use Survey.D. The population is all Americans who sleep through the night.
Mathematics
1 answer:
Gelneren [198K]3 years ago
4 0

Answer: .C. The population is the 10,900 respondents to the American Time Use Survey.

Step-by-step explanation:

In statistics , Population is refer to a large group of individuals or observations that have same characteristics.

A sample is a  subset drawn from it.

We are given that "The 2015 American Time Use survey contains data on how many minutes of sleep per night each of 10,900 survey participants estimated they get.  An SRS (simple random sample) of 100 of the participants has a mean time of x¯=514.4 minutes. "

i.e. The population is 10,900 respondents to the American Time Use Survey.

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algol13

Answer:

Therefore the third container contains   \frac{735}{17}\% = 43.23 %  acid.

Step-by-step explanation:

Given that, One container is filled with the mixture that 25% acid. 55% acid is contain by second container.

Let the volume of first container be x cubic unit.

Since the volume of second container is 55% larger than the first.

Then the volume of the second container is

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The amount of acid in first container is

=V\times \frac{25}{100}  cubic unit.

=\frac{25}{100}V  cubic unit.

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=\frac{8525}{10000}V cubic unit.

Total amount of acid =(\frac{25}{100}V+\frac{8525}{10000}V) cubic unit.

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Total volume of mixture =(V+\frac{155}{100}V) cubic unit.

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The amount of acid in the mixture is

=\frac{\textrm{The volume of acid}}{\textrm{The amount of mixture}}\times 100 \%

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=\frac{735}{17}\%

Therefore the third container contains  \frac{735}{17}\%  acid.

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The formula of the sum of a geometric sequence:

S_n=a_1\cdot\dfrac{1-r^n}{1-r}

We have:

a_1=-4;\ n=6;\ r=4

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Answer:

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Answer:

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