up to, 1  as far as or approaching (a certain part, degree, point, etc.): She went wading up to her knees. I am up to the eighth lesson. 2  in full realization or attainment of: He worked up to president of the company. 3  as many as; to the limit of: The car will seat up to five persons.
The standard deviation is a measure of how the data is clustered about the mean. For large sets of data, approximately 68.3% of the data lies within one standard deviation of the mean and approximately 95.4% of the data lies within two standard deviations of the mean.
Nigel Clark, engineer. Views. The standard deviation is a calculated value of the square root of the variance which is an accumulation of each paired data set (data point less the mean) which is squared. The value is then divided by the number of data points. By adding a constant A, you adjust the mean by that constant and then subtract it out.