PDF[NormalDistribution[0,1],x]

f[x_]:=PDF[NormalDistribution[0,1],x]

Plot[f[x], {x, -3, 3}]

PDF[NormalDistribution[0,1],2]

PDF[BinomialDistribution[6,.11],0]

PDF[BinomialDistribution[n,p],q]

PDF[PoissonDistribution[m],k]

PDF[PoissonDistribution[5], 2]

N[%]

trial = Table[Random[PoissonDistribution[5]], {i,1,10^4}];
Histogram[trial,15]