7.6.2. Probability

If a number is formed of 2 different digits from the set , find the probability of the tens digit being odd.

• A
• B
• C 0
• D
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If a number is formed of 2 different digits from the set , find the probability of the units digit being odd.

• A 0
• B
• C
• D
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The set is used in writing a number of 2 different digits, find the probability of both the digits being odd.

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• D
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A box contains 7 white, 3 black, and 8 red balls. If a ball is randomly drawn, determine the probability of drawing a black ball.

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A farm has 1 800 cows. Suppose the probability of cow madness infection in it is 0.17, what is the expected number of infected cows?

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If one of the digits of the number 224 839 287 is randomly selected, determine the probability that it is an even number.

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If a letter is selected at random from “BARCELONA”, calculate the probability of selecting the letter “H”.

• A 0
• B
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• D
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If a letter is selected at random from “BARCELONA”, calculate the probability of selecting the letter “A”.

• A
• B 0
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• D
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120 volunteers are divided into three groups to perform a certain task. If a volunteer is selected at random, what is the probability of him being in the production group?

 Group Number Design Production Distribution 25 40 55

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Jack is in a class of 36 students; 12 of them are girls. If a student is selected at random from the class, what is the probability that the student is a girl?

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Sara is in a class of 40 students; 28 of them are boys. If a student is selected at random from the class, what is the probability that the student is a boy?

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50 people have been employed by a company to work in 6 different departments. If one of them is randomly selected, what is the probability of this employee being from the sales department?

 Departments Employees Marketing Finance Customer Service Warehouse IT Sales 5 8 25 6 4 2

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If a card is drawn from a bag of 85 cards numbered from 1 to 85, calculate the probability that the drawn card carries a number greater than or equals to 11.

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If a card is drawn from a bag of 23 cards numbered from 1 to 23, calculate the probability that the drawn card carries a perfect square number.

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If a card is drawn from a bag of 30 cards numbered from 1 to 30, calculate the probability that the drawn card carries a number divisible by 3.

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A card is chosen at random from eight cards numbered . What is the probability that the selected card shows a prime number?

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A person has been randomly selected from a sample of 100 people who watch TV. What is the probability of this person preferring news?

 Programs Viewers Documentaries Drama News Sport 14 30 22 34

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If a card is chosen randomly from 14 cards numbered from 1 to 14, find the probability that the chosen card has a prime number.

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• D
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In a class that has 45 pupils, the probability of choosing a pupil whose age is less than or equal to 11 is . Find the number of pupils whose ages are more than 11 years old.

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A box contains coloured balls; red, green, blue, and yellow. If the box contains 12 green balls, where the probability of drawing one of them randomly is . What is the total number of the balls in the box?

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A bag contains 7 red marbles, 3 blue ones, and 6 white ones. If a marble is randomly selected, find the probability of it NOT being blue.

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An experiment has three outcomes. If the probability of the occurrence of the first outcome is 0.21 and that of the second outcome is 0.6, calculate the probability of the occurrence of the third outcome.

• A 0.79
• B 0.4
• C 0.81
• D 0.19
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