1. Symmetry. The curve of a normal distribution is symmetric about the ___________ x = . Left and right of axis are ___________ images: P( x) = P( x). 2. Peak. The highest point of the normal curve occurs at the mean value. The probability density ________________ at the center. 3. Probabilities. The areas under the curve, left and right of the mean, are both . So, a normal variable has ____________ probabilities of being greater than or smaller than the mean. This property reflects the symmetry of the _____________ curve