Complete the mcq:
A final Math exam has a normal distribution with mean 73 and standard deviation 3.5.
Q1- If one student is randomly selected, find the probability that his score be less than 71:
A) 0.7158 B) 0.2843 C) 0.4934 D) 0.6432
Q2- If 25 students are randomly selected, find the probability that the mean of their scores be less than 71:
A) 0.9930 B) 0.9979 C) 0.0021 D) 0.0021
Q3- Why can the Central Limit be applied , if the sample size doesn't exceed 30?
A) Because the theorem is easy to apply
B) Because the population has a Normal distribution
C) Because this theorem is very important in inferential statistics.
D) Because this theorem apply only in scores distributions.