68 percent of the data one standard deviation...........the bell curve........statistics...............6 + 5 = 11.............it is 11 : 00 on one of the cell phones at the Gallery place metro........

If a data distribution is approximately normal then about 68 percent of the data values are within one standard deviation of the mean (mathematically, μ ± σ, where μ is the arithmetic mean), about 95 percent are within two standard deviations (μ ± 2σ), and about 99.7 percent lie within three standard deviations (μ ± 3σ ...

Standard deviation - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Standard_deviation