Normal distribution with a mean of 181.0 and a standard deviation of 57.0 find the percentage between 57.0 and 181.0 using 68 - 95-99.7

Mean = 181.5

σ = 57

- σ = - 57

Between - σ and + σ the area (probability) = 68%,

Due to symmetry we have:

The left are of the mean until - σ = the right area of the mean until + σ = 34%

Then the area (probability) from μ to + 1 σ = 34%