Lydia recorded the grade-level and instrument of everyone in the middle school School of Rock below. Seventh Grade Students Instrument # of Students Guitar 12 Bass 7 Drums 11 Keyboard 3 Eighth Grade Students Instrument # of Students Guitar 8 Bass 13 Drums 4 Keyboard 7 Based on these results, express the probability that a student chosen at random will play an instrument other than drums as a fraction in simplest form.
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
| Instrument | # of Students |
|---|---|
| Guitar | 12 |
| Bass | 7 |
| Drums | 11 |
| Keyboard | 3 |
| Instrument | # of Students |
|---|---|
| Guitar | 8 |
| Bass | 13 |
| Drums | 4 |
| Keyboard | 7 |
Based on these results, express the probability that a student chosen at random will play an instrument other than drums as a fraction in simplest form.
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