The normal distribution is always bell shaped. The normal distribution is defined in terms of its mean and variance (standard deviation).

The normal distribution is always bell shaped. The normal distribution is defined in terms of its mean and variance (standard deviation). The weight gain associated with an antidepressant is normally distributed with a mean of 6 lbs and a standard deviation of 3 lbs. What is the probability of weight gain? What is the probability of gaining between 0 and 12 lbs?