Suppose that people are equally likely to have been born on any day of the week. You meet a new friend, and ask her on what day of the week she was born. April 6, 2022 Read More »
In each situation, explain whether the selection is made with replacement or without replacement. April 6, 2022 Read More »
In Example 7.15, we found that the probability that a woman with two children either has two girls or two boys is .5002. What is the probability that she has one child of each sex? April 6, 2022 Read More »
Refer to the part of Example 7.20 (pp. 236–237) in which two students are drawn without replacement from a class of 30 students in which three are left-handed. Draw a tree diagram to illustrate that the probability of selecting two lefthanded students is 1/145. April 6, 2022 Read More »
In a computer store, 30% (.3) of the computers in stock are laptops and 70% (.7) are desktops. Five percent (.05) of the laptops are on sale, while 10% (.1) of the desktops are on sale. Use a tree diagram to determine the percentage of the computers in the store that are on sale. April 6, 2022 Read More »