Self-study
Beginning in the 1950s, popular music was revolutionized by the electrification of musical instruments, which has enabled musicians to play with increased volume. ███████ ██████████ █████████ ███ ████ ████ █████████ ███████ ███ ███████ ██████ ██ █████████ ███ ████ ███ ██████████ █████████████ ███████████████ ███ █████████ ██████ ████ █████████ ███ ███████ ██████ ██ █████████ ███ ████ ███████ █████ ███████████████
Summary
The electrification of musical instruments has enabled musicians to play at increased volume. Because individual musicians can play with increased volume, the average number of musicians per band has decreased. However, the number of musicians who play popular music professionally has increased because of electrification.
Strongly Supported Conclusions
Because of electrification of musical instruments, the total number of professional bands has increased.
3.
Which one of the following ██ ████ ████████ █████████ ██ ███ ██████████ ██████ ██ █████ ██████████ ███ █████
a
The number of ███████ █████████ ███ ████ ███████ █████ ███ ██████████
This answer is unsupported. We don’t know anything about amateur musicians from the stimulus. The stimulus is limited to professional musicians.
b
Most professional musicians ███ ████ ██ ████ ████ ████████ ███ ███████████ ████████████
This answer is unsupported. We don’t know anything about nonelectric instruments from the stimulus. The stimulus is limited to electrified instruments.
c
The number of ████████████ █████████ ██ ████ █████ ███ ██████████
This answer is unsupported. The stimulus tells us that the average number of musicians per band has decreased.
d
The total number ██ ████████████ █████ ███ █████████ ██ █ ██████ ██ ████████████████
This answer is strongly supported. If the average number of musicians per band decreased at the same time the total number of musicians increased, then it must be that the total number of bands has also increased.
e
Many professional musicians ████ ██ ████ ████ ███ █████
This answer is unsupported. We don’t know from the stimulus anything about the ability to play in more than one band.