Question

The mean of a normal probability distribution is 500 and the standard deviation is 10. About 95% of the observations lie between what two values

Answer 1

480-520

Step-by-step explanation:

The lower bound would be the mean minus two standard deviations:

Lower bound = 500 - 2 * 10 = 500 - 20 = 480.

The upper bound would be the mean plus two standard deviations:

Upper bound = 500 + 2 * 10 = 500 + 20 = 520.

Therefore, approximately 95% of the observations in this normal distribution lie between the values 480 and 520.