Mr. McElroy enjoys listening to his MP3 player, which has 2,000 songs in five different genres of music. He took a sample of the number of each type of song it played on two different one-hour sessions when it was set to play a random mix. The results are displayed in the table below. What is a good prediction for the number of rock songs Mr. McElroy has on his MP3 player?

Listening Samples from Mr. McElroy's MP3 Player

Sample 1

Sample 2

Country

5

Country

3

Pop

4

Pop

3

Classical

3

Classical

5

Jazz

2

Jazz

4

Rock

6

Rock

5

225

550

1100

1667

Mark this and return

Question

Alessandro Stephens

Mathematics

14 July, 15:21

Mr. McElroy enjoys listening to his MP3 player, which has 2,000 songs in five different genres of music. He took a sample of the number of each type of song it played on two different one-hour sessions when it was set to play a random mix. The results are displayed in the table below. What is a good prediction for the number of rock songs Mr. McElroy has on his MP3 player?

Listening Samples from Mr. McElroy's MP3 Player

Sample 1

Sample 2

Country

5

Country

3

Pop

4

Pop

3

Classical

3

Classical

5

Jazz

2

Jazz

4

Rock

6

Rock

5

225

550

1100

1667

Mark this and return

+2

Answers (2)

Know the Answer?

Kenley Ellis · Answer 1

The correct number is 550 rock songs.

Step-by-step explanation:

To find this, we start by determining how many songs there were in each trial.

5+4+3+2+6 = 20

3+3+5+4+5 = 20

Next we need to find the average number of rock songs in the trials.

(6+5) / 2 = 5.5

Now to find the average percentage of songs, divide the rock songs by overall.

5.5/20 = 27.5%

Now we can multiply that percentage by the total number of songs on the mp3 player.

2000*27.5% = 550 Songs

Autumn Dudley · Answer 2

550 rock songs