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Grace [21]
3 years ago
9

On Saturday 45 percent of the music Brianna listened to was country songs . She listened to 27 country songs on Saturday . How m

any songs did she listen to on Saturday
Mathematics
1 answer:
polet [3.4K]3 years ago
4 0

Answer:

60 songs

Step-by-step explanation:

Hey there!

When dealing with percents, whenever you see the were is or was, it is an equal sign. Here, we see that 45% of the music she listened to was country, and 27 songs were country.

0.45x=27

Now, we solve.

x=60

Therefore, Brianna listened to 60 songs.

I hope this helps!

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Answer:

s= \sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}

And replacing we got:

s= 0.286

And then the estimator for the standard error is given by:

SE= \frac{0.286}{\sqrt{4}}= 0.143

Step-by-step explanation:

For this case we have the following dataset given:

20.05, 20.56, 20.72, and 20.43

We can assume that the distribution for the sample mean is given by:

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And the standard error for this case would be:

SE= \frac{\sigma}{\sqrt{n}}

And we can estimate the deviation with the sample deviation:

s= \sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}

And replacing we got:

s= 0.286

And then the estimator for the standard error is given by:

SE= \frac{0.286}{\sqrt{4}}= 0.143

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3 years ago
この問題を最も簡単に解決する. 不適切な回答はありません.
Dafna1 [17]

japones ^^

look you have to multiply

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Step-by-step explanation:

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