Question

a normal distribution has a mean of 645.33 and a staandard deviations of 12.78 approximately 68 percent of the data will lie between which two value

Answer 1

Approximately 68% of the data will lie between one standard deviation below the mean and one standard deviation above the mean.

One standard deviation below the mean:
645.33 - 12.78 = 632.55

One standard deviation above the mean:
645.33 + 12.78 = 658.11

Therefore, approximately 68% of the data will lie between 632.55 and 658.11.