Statistics

Step 1: Understanding each measure.
- Mode: The most frequent value in a dataset. Simplest measure.
- Mean: The average value of data. Slightly more complex.
- Median: The middle value when data is sorted. More robust than mean for skewed data.
- Range: Difference between maximum and minimum values. Describes spread in a simple way.
- Standard Deviation: Measures how much data deviates from the mean. Most complex spread measure.

Step 2: Ordering them.
From simplest to most complex: (A) Mode (B) Mean (C) Median (D) Range (E) Standard Deviation.
Step 3: Verification with options.
Option 2 exactly matches this order.
Final Answer:

Step 1: Recall definitions.
- Range: Difference between maximum and minimum values → Correct.
- Mean: Represents central tendency, not a measure of variability → Incorrect.
- Standard Deviation: Measures how data points differ from the mean (a measure of variability) → Correct.
- Variability/Dispersion: Both terms refer to spread of data → Correct.

Step 2: Conclusion.
The incorrect statement is that Mean is a measure of variability. Mean is a measure of central tendency, not dispersion.
Final Answer: