When rolling two dice, what is the probability that at least one of the dice shows a five?

A research team at Cornell University conducted a study showing that approximately 10% of all businessmen who wear ties wear them so tightly that they actually reduce blood flow to brain, diminishing cerebral functions. At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that at least one tie is too tight?

An algebra 2 test has 5 multiple choice questions with four choices with one correct answer each. If we just randomly guess on each of the 5 questions, what is the probability that you get at least 1 question correct?

The American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school.What is the probability that exactly 1 of the first 5 blood donors have Type B blood? 

When rolling two dice, the probability of rolling doubles is ⅙. Suppose that a game player rolls the dice five times, hoping to roll doubles. What is the probability the player gets doubles at least once in 5 attempts?

Barry Bonds has a career batting average of .298. What is the probability that he will get a hit at least once in 4 at bats?

In Vietnam, the probability of rain is 60%.  Find the probability of it raining at least once in a week.

If a standard die is rolled 8 times, find the probability of rolling a number 4 at least twice.

According to a recent survey, 15% of houses in America are haunted by a ghost. If your neighborhood block has 6 houses, what is the probability that at least one house is haunted on your block?