Variation & Standard Deviation
Standard deviation is a measure of how spread out the data is.
The greater the standard deviation, the greater the spread of data.
A normal distribution is usually a bell-shaped curve.
# Characteristics of normal distribution
- Mean, mode and median are equal
- bell shaped
- Symmetrical (50% higher than mean, 50% lower)
- Most values are close to the mean
- Few individuals at extremes