To find a ming and standard deviation. We first need to find the uh probability distribution. And so let's look for each case and their probabilities First, you're is a probability of 1/3 that There's only one customer and The probability of 2/3 that there are two customers. And if there is only one customer, There is a probability .1 that the contact will result in no seal and .9 that the contact will result in yourself and has this to number of the provide possibilities. And if there are two customers since these two sales are independent, so their distribution is a phenomenal distribution and we can use a formula bell nominal distribution And this 3 uh the probabilities of the phenomenal distribution, but also we need to time. The probability is that there are two customers Which is 2/3 in the hands. This uh the total probability. Now we can write the probability, so the probability of zero is this number plus this number, We just zero, awful. And the probability 50,000 is just as this number boss. This number And it's part for two. The probability of handover Selden The PIN 252. So now we can calculate the me and according to the formula is just as some oh The probability of wild times the value of one and it recalls zero times .04, clause 50,000 times point of 4 to plus a handler. Selden times point of forfar And the number is 75 seldom. You too calculated the standard deviation. We first calculate the veterans and various echoes the expectation of Y squared miners, the square of expectation, Why this? This is just me and the expectation Y squared. It's just that the submission of the proper detail, white times the value of y square and the value is 6.45 times turned through the power I'm not. And then we can calculate the barracks, which is 8.25 times central power of eight, and the standard division, just as the square root of the virus, which is approximately 28,000 722 points eight.