Central Tendency
1. **Understanding measures of central tendency:** The measures of central tendency are statistical values that describe the center or typical value of a data set.
2. **Common measures include:**
- **Mean:** The average value calculated by summing all data points and dividing by the number of points.
- **Median:** The middle value when the data points are arranged in ascending order.
- **Mode:** The value that appears most frequently in the data set.
3. **Solving problems involving these measures:** You first identify which measure is required, then apply the corresponding formula or procedure.
4. **Example problem:** Find the mean, median, and mode for the data set: $[3, 7, 7, 2, 9, 10, 7]$.
5. **Step 1 - Calculate the mean:** Sum all values: $3+7+7+2+9+10+7 = 45$.
Number of data points = $7$.
Mean $= \frac{45}{7} \approx 6.43$.
6. **Step 2 - Calculate the median:** Sort data: $[2, 3, 7, 7, 7, 9, 10]$.
Median is the middle value at position $\frac{7+1}{2} = 4$.
Median $= 7$.
7. **Step 3 - Calculate the mode:** The number appearing most frequently is $7$, appearing three times.
Mode $= 7$.
8. **Summary:**
Mean $\approx 6.43$, Median $= 7$, Mode $= 7$.
This shows central tendency using mean, median, and mode for the given set.