The daily number of cases of a devastating disease at a certain country averages 130, with a standard deviation of 5. What can we say about the fraction of days on which the number of cases falls between 120 and 140? 0 At least in 3 out of 4 days we will observe between 120 and 140 cases 0 At most in 3 out of 4 clays we will observe between 120 and 140 cases 0 Between 68 and 70% of the days we will observe between 120 and 140 cases 0 We can not tell without knowing the distribution of the number of cases per day. 11 Let X denote the average of a set of independent and identically distributed random variables, X1, X2, ....., Xn . Convergence in probability of X to the E (Xi ) means that the limit, as n goes to infinity, of P ( U- E