Normal distribution curve of different mental traits of individuals ts given be- low. What type of individuals’ mental traits does It indicate?
Normal distribution curve of different mental traits of individuals ts given be- low. What type of individuals’ mental traits does It indicate? Correct Answer Individuals of different intellgence
Normal Distribution Curve: The normal curve is a symmetrical bell-shaped curve characteristic of many variables in nature, including human characteristics and performance (e.g., height, reaction time, etc.).
- The Normal Curve is symmetrical about the ordinate at the central point of the curve. It is unimodal, the model is always at the central point of the curve. It is asymptotic to the x-axis. The points of influx occur at ± 1 σ.
- The area of the curve between the points of inflection is fixed.
Important Points
Key Points
- The Points of Influx occur at point ±1 Standard Deviation (± 1 σ): The normal curve changes its direction from convex to concave at a point recognized as point of influx. If we draw the perpendiculars from these two points of an influx of the curve to the horizontal X-axis; touch at a distance of one standard deviation unit from above and below the mean (the central point).
- The Total Percentage of Area of the Normal Curve within Two Points of Influxation is fixed: Approximately 68% area of the curve lies within the limits of ± 1 standard deviation (± 1 σ) unit from the mean.
- The Total Area under the Normal Curve may be also considered a 100 Percent Probability.
| Standard deviations | % of cases |
| Between -3σ and +3σ | 99.7% |
| Between -2σ and +2σ | 95% |
| Between -1σ and +1σ | 68% |
Hence, we can conclude that a normal distribution curve is an indication of Individuals of different intelligence.
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Feb 20, 2025