A student in the hardest math class at UO has only 10 chance

A student in the hardest math class at UO has only 10% chance of gettingan A. Not surprisingly, only 30 students is taking this class. Roughly, whatis the probability that at most 1 student will get an A?

Solution

Using a cumulative binomial distribution table or technology, matching          
          
n = number of trials =    30      
p = the probability of a success =    0.1      
x = the maximum number of successes =    1      
          
Then the cumulative probability is          
          
P(at most   1   ) =    0.183695019 [ANSWER]