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These facts are mentioned on the Basic Probability page and the Breif Summary of the Binomial Distribution page The lowest possible probability an outcome might have is 0 P(x=7)=0, the probability of getting 7 heads, when only 4 coins are flipped, is 0The normal distribution or Gaussian distribution is a continuous probability distribution that follows the function of where μ is the mean and σ 2 is the variance Note that standard deviation is typically denoted as σ Also, in the special case where μ = 0 and σ = 1, the distribution is referred to as a standard normal distributionIn order to do this, we define a function P, such that P(X = x) is the probability of the variable X having a value of x We could also ask for P(X < x), or P(X > x), for intervals instead of discrete values This will become even more relevant soon P is the variable's density function, and it characterizes that variable's distribution Excel Probability Distributions P(x=x) probability distribution f