1. What is sampling error? How important is the Central Limit Theorem in using normal probability to make sample inferences? Why should the sample be equal to or greater than 30 observations?2. According to a study by the Suicide Prevention Association, it was found that 10% of university students have high levels of tension and emotional problems as a result of the COVID19 crisis.a. In a sample of eight students, what is the probability that three students have high levels of tension and emotional problems? P (X=3 n=8, p=.10)b. In a sample of ten students, what is the probability that at least four students high levels of stress and problems emotional? P(X <4] n=10, p=.10)c. In a sample of five students, what is the probability that no student has high levels of stress and emotional problems by COVID-19? P(X=0] n=5, p=.10)