Suppose you are taking a 15 question True/False quiz which you are not prepared for. You find yourself simply guessing at every answer. What is the probability that you get less than 3 answers correct?

And adding the results we got:

Step-by-step explanation:

We can define the variable of interest s X representing the number of correct questions for the exam. and we can model this random variable with a binomial distribution. The probability of select the correct answer would be since is a true/false question.

And we want to find this probability:

The probability mass function for the Binomial distribution is given as:

Where (nCx) means combinatory and it's given by this formula:

And we want to find this probability:

We can find the individual probabilities and we got:

And adding the results we got:

i believe it's a.

i'm not sure on this one, most likely correct.

where is the graph? need more info