Epilepsy is a chronic neurological disease characterized by recurrent seizures. A high proportion of people with epilepsy continue to have seizures even with the best available treatments. Let X be the number of annual epileptic seizures suffered by a patient subjected to a certain medication. The table shows the distribution of X. (approximately 2 decimal places) N Ataques 1 2 3 4 5

P(x) 0.02 0.3 0.4 0.2 a. What is the probability that a patient will have at least one attack in a year? = Answer b. What is the probability that he will suffer exactly two attacks? = Answer C. What is the value E(X)? = Answer d. What is the value of the standard deviation of X? = Answer