Question

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

Answer 1

b

Explanation:

sheeeeesh

Answer 2

The correct number is 550 rock songs.

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