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givi [52]
2 years ago
14

A fan of country music plans to make a custom cd with 1313 of her 2525 favorite songs. how many different combinations of 1313 s

ongs are​ possible? is it practical to make a different cd for each possible​ combination? how many different combinations of 1313 songs are​ possible?
Mathematics
1 answer:
ss7ja [257]2 years ago
4 0
This is asking how many ways can we choose 13 songs from a set of 25.
The formula is:
n! / r! * (n -r)!    =

25! / 13! * 12! which equals

25 *24 *23 *22 *21 *20 *19 *18 *17 *16 *15 *14 *13!  divided by
13! * 12! which equals

25 *24 *23 *22 *21 *20 *19 *18 *17 *16 *15 *14 divided by
12* 11* 10* 9* 8* 7* 6* 5* 4* 3* 2*

which equals

<span> <span> <span> 2,490,952,020,480,000 </span> </span> </span> divided by <span> <span> <span> 479,001,600 </span> </span> </span>

and that equals
<span> <span> <span> 5,200,300 </span> </span> </span> combinations

Here's a combination calculator to check your work:
http://www.1728.org/combinat.htm






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The statement that: pairs of corresponding points lie on parallel lines in a reflection, is false.

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When a point is reflected, the following highlights are possible

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Using the above highlights, we can conclude that the statement is false.

This is so because, corresponding points are not always on parallel lines

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Answer:

In a normal distribution, 50 percent of the data are above the mean, and 50 percent of the data are below the mean. Similarly, 68 percent of of all data points are within 1 standard deviation of the mean, 95 percent of all data points are within 2 standard deviations of the mean, and 99.7 percent are within 3 standard deviations of the mean.

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

Also:

The normal distribution is symmetric, which means that 50% of the data is above the mean and 50% is below.

Then:

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