New SAT Math Workbook

# What is the probability that any patron will select

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Unformatted text preview: eatest, the dollar difference between non-minority and minority awards was approximately: (A) (B) (C) (D) (E) 38 degrees 42 degrees 52 degrees 62 degrees 66 degrees (A) (B) (C) (D) (E) \$130,000 \$160,000 \$220,000 \$270,000 \$400,000 www.petersons.com Additional Geometry Topics, Data Analysis, and Probability 297 Questions 4 and 5 are based on the following figure, which compares the race times of ten different cyclists, all of whom competed in the same two races (race 1 and race 2). 4. Among the five cyclists identified in the figure as A, B, C, D, and E, which had the fastest combined (total) race time for races 1 and 2? (A) A (B) B (C) C (D) D (E) E Considering the ten cyclists as a group, which of the following most closely approximates the ratio of the average time for race 1 to the average time for race 2? (A) 1:2 (B) 2:3 (C) 1:1 (D) 3:2 (E) 2:1 5. www.petersons.com 298 Chapter 16 6. PROBABILITY The new SAT includes simple questions involving probability, which refers to the statistical chances, or “odds,” of an event occurring (or not occurring). By definition, probability ranges from 0 to 1. (Probability is never negative, and it’s never greater than 1.) You can express probability either as either a fraction or a percent. Here’s the basic formula: Probability = total number of possible occurrences Example: A standard deck of 52 playing cards contains 12 face cards. What is the probability of selecting a face card from such a deck? Solution: The correct answer is 52 , or 13 . There are 12 ways that a face card could be selected at random from the standard 52-card deck. To calculate the probability of an event NOT occurring, just subtract the probability of the event occurring from 40 10 1. Referring to the preceding example, the probability of NOT selecting a face card would be 52 , or 13 . (Sub12 tract 52 from 1.) An SAT probability problem might involve the probability of two independent events both occurring. Two events are “independent” if neither event affect...
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## This note was uploaded on 08/15/2010 for the course MATH a4d4 taught by Professor Colon during the Spring '10 term at Embry-Riddle FL/AZ.

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