Practice Problems for the Lander Math Contest
Module 7, Problems (19-21)
19) What is the probability of not getting 3 in rolling a fair die
20) A basketball player has 65% chance to throw the ball into
the basket. What is the probability of at most 6 successful
throws out of 7?
21) In a bag with 12 coins 5 are normal, 2 are two-sided
heads and the remaining coins are two-sided tails. What is
the probability that a coin taken at random from the bag and
being tossed 4 times, turns out to be exactly 3 heads and one
22) For additional practice, try some or all of the Practice
This Concept problems in the upper right hand corner green
boxes of the Khan Academy Probability (Part 1) web page.