Answer to Question #59919 in Statistics and Probability for joseph ogala

Question

6 Suppose a fair on is tossed three times, what is the probability that at least one head occurs?

7 Suppose a box contains 4 red balls and 3 black balls. Compute the probability that the second ball drawn is red if the first ball drawn was black.

8 There are three children in a family. If there is at least one boy and at most two boys in this family. What is the conditional probability that there are exactly two boys in this family?

9 Two women A, and B share an office with a single telephone. The probability that any call will be for A is 2/3 . Suppose that A is out of her office during the office hours half of the time and B one third. Find the probability that for any call during the working hours. A call can be answered by the person being called.

10 A box contains 6 balls numbered 1 to 6. A ball was drawn from the box at random. Find the probability that the number on the ball drawn was either 1, 2, or 6