Assume that your favorite statistics professor (Who else, but me!) receives an average of five e-mail messages per day from stud
ents. If the number of messages approximates a Poisson distribution, what is the probability that on a randomly selected day your professor will have five messages?
there was 20 dogs in total he took 1 black dog now 19 in total, now 9 black dogs and 10 brown dogs so one less probability of black dogs so 9 black dogs and 10 brown dogs so 9/19
