Stat 320-1 Lecture 5

You take a multiple choice test that has 10 questions and 3 answers per quetsion. For each question, there is one correct answer. You decide to guess at random. Suppose there is a 1/3 chance you get eacxh question right. What is the probability that you get at least half of hte answers right?

0.213

A coin is tossed until heads is seen 3 times. What is the probability that this takes exactly 10 tosses?

Suppose a biased coin comes up heads with a probability of 0.3
when tossed. What is the probability of seeing 4 heads in 6 tosses?

what the heck