Stats

Question 1

In a normal distribution, what percentage of observations lie within 1 standard deviation of the mean?

Answer 1

~68%.

Question 2

In a normal distribution, what percentage of observations lie within 2 standard deviations from the mean?

Answer 2

~95%.

Question 3

In a normal distribution, what percentage of observations lie within 3 standard deviations from the mean?

Answer 3

~99.7%.

Question 4

What does standard deviation measure?

Answer 4

The dispersal about the mean for a whole population.