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概率   题数:9
Each of the 25 balls in a certain box is either red, blue, or white and has a number from 1 to 10 painted on it. If one ball is to be selected at random from the box, what is the probability that the ball selected will either be white or have an even number painted on it? (1) The probability that the ball will both be white and have an even number painted on it is 0. (2) The probability that the ball will be white minus the probability that the ball will have an even number painted on it is 0.2.
【OG19-P278-309题】Terry holds 12 cards, each of which is red, white, green, or blue. If a person is to select a card randomly from the cards Terry is holding, is the probability less than 1/2 that the card selected will be either red or white?(1) The probability that the person will select a blue card is 1/3.(2) The probability that the person will select a red card is 1/6.
A box contains 10 light bulbs, fewer than half of which are defective. Two bulbs are to be drawn simultaneously from the box. If n of the bulbs in box are defective, what is the value of n?(1)The probability that the two bulbs to be drawn will be defective is 1/15.(2)The probability that one of the bulbs to be drawn will be defective and the other will not be defective is 7/15.
Seven different numbers are selected from the integers 1 to 100, and each number is divided by 7. What is the sum of the remainders?(1) The range of the seven remainders is 6.(2) The seven numbers selected are consecutive integers.
What is the probability that a student randomly selected from a class of 60 students will be a male who has brown hair?(1) One-half of the students have brown hair.(2) One-third of the students are males.
A box contains only red chips, white chips, and blue chips. If a chip is randomly selected from the box, what is the probabilitythat the chip will be either white or blue?(1) The probability that the chip will be blue is 1/5(2) The probability that the chip will be red is 1/3
What is the probability that event E or event F or both will occur?(1) The probability that event E will occur is 0.6.(2) The probability that event F will occur is 0.4.
【OG20-P274-245题】Each of the marbles in a jar is either red or white or blue. If one marble is to be selected at random from the jar, what is the probability that the marble will be blue?(1) There are a total of 24 marbles in the jar, 8 of which are red.(2) The probability that the marble selected will be white is 1/2.
【OG20-P275-258题】How many people in a group of 50 own neither a fax machine nor a laser printer?(1) The total number of people in the group who own a fax machine or a laser printer or both is less than 50.(2) The total number of people in the group who own both a fax machine and a laser printer is 15.
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