20 easy SAT Probability & conditional probability questions

A survey of 50 students asked whether they prefer basketball or soccer. Of the students surveyed, 18 prefer basketball and 32 prefer soccer. If one of these students is selected at random, what is the probability of selecting a student who prefers basketball?

• A$\displaystyle \frac{18}{32}$
• B$\displaystyle \frac{18}{50}$
• C$\displaystyle \frac{32}{50}$
• D$\displaystyle \frac{50}{50}$

Each face of a fair 18-sided die is labeled with a number from 1 through 18, with a different number appearing on each face. If the die is rolled one time, what is the probability of rolling a number greater than 15?

• A$\displaystyle \frac{1}{18}$
• B$\displaystyle \frac{2}{18}$
• C$\displaystyle \frac{3}{18}$
• D$\displaystyle \frac{15}{18}$

A class has 25 students: 14 students have brown hair, 6 students have blonde hair, and 5 students have black hair. If one student is selected at random from the class, what is the probability of selecting a student with brown hair?

• A$\displaystyle \frac{11}{25}$
• B$\displaystyle \frac{14}{25}$
• C$\displaystyle \frac{14}{11}$
• D$\displaystyle \frac{20}{25}$

A jar contains 50 tokens: 18 gold tokens, 15 silver tokens, and 17 bronze tokens. If one token is selected at random from the jar, what is the probability of selecting a silver token?

• A$\displaystyle \frac{15}{35}$
• B$\displaystyle \frac{17}{50}$
• C$\displaystyle \frac{32}{50}$
• D$\displaystyle \frac{15}{50}$

A class has 40 students: 15 students who play piano, 13 students who play guitar, and 12 students who play drums. If one student is selected at random from the class, what is the probability of selecting a student who plays drums?

• A$\displaystyle \frac{12}{28}$
• B$\displaystyle \frac{12}{40}$
• C$\displaystyle \frac{13}{40}$
• D$\displaystyle \frac{25}{40}$

A container holds 36 blocks: 14 red blocks, 12 yellow blocks, and 10 green blocks. If one block is selected at random from the container, what is the probability of selecting a yellow block?

• A$\displaystyle \frac{10}{36}$
• B$\displaystyle \frac{12}{24}$
• C$\displaystyle \frac{22}{36}$
• D$\displaystyle \frac{12}{36}$

A bag contains 6 red marbles, 4 blue marbles, and 5 green marbles. If one marble is selected at random from the bag, what is the probability of selecting a red marble?

• A$\displaystyle \frac{1}{6}$
• B$\displaystyle \frac{6}{15}$
• C$\displaystyle \frac{9}{15}$
• D$\displaystyle \frac{10}{15}$

A bag contains 15 marbles: 6 red marbles, 5 blue marbles, and 4 green marbles. If one marble is selected at random from the bag, what is the probability of selecting a red marble?

• A$\displaystyle \frac{4}{15}$
• B$\displaystyle \frac{6}{15}$
• C$\displaystyle \frac{9}{15}$
• D$\displaystyle \frac{6}{9}$

A container holds 40 buttons: 16 small buttons, 14 medium buttons, and 10 large buttons. If one button is selected at random from the container, what is the probability of selecting a large button?

• A$\displaystyle \frac{10}{30}$
• B$\displaystyle \frac{10}{40}$
• C$\displaystyle \frac{20}{40}$
• D$\displaystyle \frac{30}{40}$

A company produces light bulbs, and 17 out of every 100 light bulbs produced are defective. If a light bulb produced by this company is selected at random, what is the probability of selecting a defective light bulb?

• A$\displaystyle \frac{83}{100}$
• B$\displaystyle \frac{17}{100}$
• C$\displaystyle \frac{17}{83}$
• D$\displaystyle \frac{100}{17}$

A box contains 24 pencils: 9 yellow pencils, 7 red pencils, and 8 black pencils. If one pencil is selected at random from the box, what is the probability of selecting a yellow pencil?

• A$\displaystyle \frac{9}{24}$
• B$\displaystyle \frac{9}{15}$
• C$\displaystyle \frac{15}{24}$
• D$\displaystyle \frac{17}{24}$

A box contains 12 red marbles and 8 blue marbles. If one marble is selected at random from the box, what is the probability of selecting a red marble?

• A$\displaystyle \frac{8}{20}$
• B$\displaystyle \frac{12}{20}$
• C$\displaystyle \frac{12}{8}$
• D$\displaystyle \frac{20}{12}$

A jar contains 30 candies: 12 chocolate candies, 10 mint candies, and 8 fruit candies. If one candy is selected at random from the jar, what is the probability of selecting a mint candy?

• A$\displaystyle \frac{10}{30}$
• B$\displaystyle \frac{10}{20}$
• C$\displaystyle \frac{18}{30}$
• D$\displaystyle \frac{20}{30}$

In a deck of 30 cards, 12 cards are labeled A, 10 cards are labeled B, and 8 cards are labeled C. If one card is selected at random from the deck, what is the probability of selecting a card labeled C?

• A$\displaystyle \frac{8}{22}$
• B$\displaystyle \frac{8}{30}$
• C$\displaystyle \frac{10}{30}$
• D$\displaystyle \frac{18}{30}$

A box contains 24 pencils: 9 yellow pencils, 7 red pencils, and 8 blue pencils. If one pencil is selected at random from the box, what is the probability of selecting a blue pencil?

• A$\displaystyle \frac{8}{24}$
• B$\displaystyle \frac{8}{16}$
• C$\displaystyle \frac{15}{24}$
• D$\displaystyle \frac{16}{24}$

A spinner has 5 equal sections labeled 1 through 5. If the spinner is spun one time, what is the probability of landing on a section labeled with an odd number?

• A$\displaystyle \frac{2}{5}$
• B$\displaystyle \frac{2}{3}$
• C$\displaystyle \frac{3}{5}$
• D$\displaystyle \frac{5}{3}$

A jar contains 30 jellybeans: 11 purple jellybeans, 9 orange jellybeans, and 10 green jellybeans. If one jellybean is selected at random from the jar, what is the probability of selecting a purple jellybean?

• A$\displaystyle \frac{9}{30}$
• B$\displaystyle \frac{11}{19}$
• C$\displaystyle \frac{11}{30}$
• D$\displaystyle \frac{19}{30}$

A box contains 30 cards numbered 1 through 30. If one card is selected at random from the box, what is the probability of selecting a card numbered with a multiple of 5?

• A$\displaystyle \frac{24}{30}$
• B$\displaystyle \frac{6}{24}$
• C$\displaystyle \frac{30}{6}$
• D$\displaystyle \frac{6}{30}$

A box contains 30 tokens: 12 silver tokens, 9 gold tokens, and 9 bronze tokens. If one token is selected at random from the box, what is the probability of selecting a bronze token?

• A$\displaystyle \frac{9}{21}$
• B$\displaystyle \frac{9}{30}$
• C$\displaystyle \frac{12}{30}$
• D$\displaystyle \frac{18}{30}$

A bag contains 6 plastic tiles labeled with the letters A, B, C, D, E, and F. If one tile is selected at random from the bag, what is the probability of selecting a tile labeled with a vowel?

• A$\displaystyle \frac{4}{6}$
• B$\displaystyle \frac{2}{4}$
• C$\displaystyle \frac{2}{6}$
• D$\displaystyle \frac{6}{2}$