poisson probability mass function lastlythe other distribution function you might hear about is poisson probability mass functionand this has very specific application it looks lot like normal distributionbut it' little bit different the idea here isif you have some information about the average number of things that happen in given time periodthis probability mass function can give you way to predict the odds of getting another value insteadon given future day as an examplelet' say have websiteand on average get visitors per day can use the poisson probability mass function to estimate the probability of seeing some other value on specific day for examplewith my average of visitors per daywhat' the odds of seeing visitors on given daythat' what poisson probability mass function can give you take look at the following codegspntdjqztubutjnqpsuqpjttpo jnqpsunbuqmpumjcqzqmpubtqmu nv  oqbsbohf qmuqmpu qpjttpoqng nv in this code examplei' saying my average is mu ' going to set up some values to look at between and with spacing of  ' going to plot that using the qpjttpoqng function can use that graph to look up the odds of getting any specific value that' not assuming normal distribution