Given: Mobile Phone Number Conduct a simple study. Gather data by asking every student in class the last digit of his or her mobile phone number. Write down the answers then tally the results in a frequency distribution. Let the random variable X be the last digit of the mobile phone number of a student from the class. Then, using MS Excel, construct the probability mass function of X. Using the Chart Wizard tool, construct the probability histogram of X. Based on the probability mass function of X, find the following probabilities involving X: P(X4), P(X7), and P(3 X 6). looking for mean, variance Digits: 1,2,2,3,3,5,5,5,6,7,8,