Tolong jelaskan mengenai For all normal distributions, dari Sebaran normal dalam bahasa sunda

the density function is symmetric about its méan value. About 68% of the aréa under the curve is within one standard deviation of the méan, 95.5% within two standard deviations, and 99.7%  within three standard deviations. The inflection points of the curve occur at one standard deviation away from the méan.