Question: Miko checked her mobile data usage and her phone retrieved the following data with the graph as shown below. How much data did she use from week 2 to week 3?
1. **State the problem:** We need to find how much data Miko used from week 2 to week 3 based on the graph data.
2. **Identify data usage values:** From the graph description:
- Data at week 2 is about $350$ mb.
- Data at week 3 is about $500$ mb.
3. **Formula used:** The data used between two weeks is the difference in data usage:
$$\text{Data used} = \text{Data at week 3} - \text{Data at week 2}$$
4. **Calculate the difference:**
$$\text{Data used} = 500 - 350$$
5. **Simplify:**
$$\text{Data used} = 150$$
6. **Interpretation:** Miko used $150$ mb of data from week 2 to week 3.
**Final answer:** $150$ mb