Bill is taking a 20 question True/false test. If he guesses on each question what is the probability that he ...

  

(1) A test administered to 300. Math 111 students. The results were approx normally distributed with mean 82 n standard deviation 6. Find a value for x such that 75% of the scores are above x.
 

(2) Bill is taking a 20 question True/false test. If he guesses on each question what is the probability that he
A will get exactly 13 question right? Use normal approximation for this binomial
B will get at least 13 questions correct? Use a normal approximation for this binomial
C will get at most 7 correct? Use normal approximation for this binomial