tailieunhanh - Geomegy review 6

Tham khảo tài liệu 'geomegy review 6', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | PROBLEM SOLVING Probability Probability measures the likelihood that a specific event will occur. Probabilities are expressed as fractions. To find the probability of a specific outcome use this formula PrnbabiliHT- nfan pvpnt .n umbe r of specific outcomes probaDility of an event total number of possible outcomes Example If a hat contains nine white buttons five green buttons and three black buttons what is the probability of selecting a green button without looking Probability number of specific outcomes total number of possible outcomes number of green buttons ProDaDility - total number of buttons Probability 9 5 3 Probability yy Therefore the probability of selecting a green button without looking is yy. Practice Question A box of DVDs contains 13 comedies four action movies and 15 thrillers. If Brett selects a DVD from the box without looking what is the probability he will pick a comedy . 1 a. 32 b. n e 11 c. 32 4 13 d. 15 e e. 4 Answer number of specific outcomes . Probability is totnlnumbeoropposXleoutmomes . Therefore you can set up the following fraction number of comedy DVDs _ 13 _ 1 3 total number of DVDs 13 4 15 32 Therefore the probability of selecting a comedy DVD is - . 169 ----------------------------------------- PROBLEM SOLVING ---------------------------------------------------- Multiple Probabilities To find the probability that one of two or more mutually exclusive events will occur add the probabilities of each event occurring. For example in the previous problem if we wanted to find the probability of drawing either a green or black button we would add the probabilities together. The probability of drawing a green button -jj. number ofblack buttons 3 3 The probability of drawing a black button total numberof buttons 9 5 3 n. 5 3 8 So the probability for selecting either a green or black button ỳy yy yy. Practice Question At a farmers market there is a barrel filled with apples. In the barrel are 40 Fuji apples 24 Gala apples 12 Red Delicious