Question

Hi please help, can you calculate the standard deviations without knowing the mean? if yes/no why?

Answer 1

No. Because the standard deviation is defined as\[\sigma = \sqrt{ \sum {1 \over N} (x_i - \mu)^2}\]We need to mean to subtract from the individual population values.

Answer 2

No. The standard deviation is a measurement of by how much something varies from an average; "two standard deviations from the mean."

Answer 3

Thanks :)

Answer 4

Example: "fewscrewsmissing's mathematical ability is within 1 standard deviation of the mean. eashmore's, however, are outside 2 standard deviations above the mean."

Answer 5

Thank you sir. I've always thought of my abilities as being in the top 2.1 percentile.