Question

In a normal curve what is the area that comes under 1 standard deviation :

• A. 50%
• B. 68%
• C. 95%
• D. 100%

Answer 1

The Correct Option is B

To find the area under a normal distribution curve within 1 standard deviation of the mean, we use the empirical rule, also known as the 68-95-99.7 rule. This rule states:

• 68% of the data falls within 1 standard deviation (σ) of the mean (μ).
• 95% falls within 2 standard deviations.
• 99.7% falls within 3 standard deviations.

Therefore, the percentage of the area that comes under 1 standard deviation from the mean is 68%.