Help with STATS

Question

Assume that random guesses are made for 7 multiple-choice questions on a test with 2 choices for each question, so that there are nequals7 trials, each with probability of success (correct) given by pequals0.50. Find the probability of no correct answers.

Answer 1

hi Malina,

 

find the probability that he guesses wrong 7 times

 

p(no right answers) = (.5)⁷

 

= 1/128