Question

According to the empirical rule, if the data form a "bell-shaped curve" (normal distribution), approximately what percent of the observations will be contained within + /- 2 standard deviations from the arithmetic mean. (Select the correct answer from the choices below.)A. 99.7B. 95.0C. 75.0D. 68.3

Answer 1

Answer: B. 95.0

Explanation:

In statistics , the famous empirical rule says that " if the data is normally distributed then 68% of the observations will be contained within
`\pm1` standard deviations from the arithmetic mean, 95% of the observations will be contained within
`\pm2` standard deviations from the arithmetic mean and 99.7% of the observations will be contained within
`\pm3` standard deviations from the arithmetic mean".

Hence, B is the correct answer.