Tango Hiphop Quickstep
1. **State the problem:** We want to find two probabilities based on the Venn diagram data of 45 dancers who like tango (T), hip-hop (H), or quick-step (Q).
2. **Identify the numbers from the Venn diagram:**
- T only = 9
- T & H only = 2
- T & Q only = 8
- T & H & Q = 1
- H only = 7
- H & Q only = 3
- Q only = 10
- Outside all circles = 5
3. **Calculate the total number who like tango (T):**
$$9 + 2 + 8 + 1 = 20$$
4. **Find the number who like both tango and hip-hop:**
This includes T & H only plus T & H & Q:
$$2 + 1 = 3$$
5. **Calculate the probability that a randomly selected tango lover also likes hip-hop:**
$$P(H|T) = \frac{\text{Number liking both } T \text{ and } H}{\text{Number liking } T} = \frac{3}{20}$$
6. **Calculate the number who do NOT like hip-hop:**
Total dancers = 45
Number who like hip-hop = sum of H only, H & T only, H & Q only, and T & H & Q:
$$7 + 2 + 3 + 1 = 13$$
Number who do NOT like hip-hop:
$$45 - 13 = 32$$
7. **Find the number who do NOT like hip-hop but like quick-step:**
This includes Q only plus T & Q only (because they include Q and not H), excluding any overlaps with H.
From the Venn diagram:
- Q only = 10
- T & Q only = 8
- T & H & Q includes H, so exclude it
- H & Q only includes H, so exclude it
So the number who like Q but NOT H:
$$10 + 8 = 18$$
8. **Calculate the probability that a dancer selected at random from those who don't like hip-hop does like the quick-step:**
$$P(Q|\text{not } H) = \frac{18}{32} = \frac{9}{16}$$
**Final answers:**
- Probability a tango dancer also likes hip-hop: $\frac{3}{20}$
- Probability a non-hip-hop dancer likes quick-step: $\frac{9}{16}$