Probability + reason - practice problems
Number of problems found: 132
- Family survey
A total of 160 families with 4 children each were surveyed with the following results. Boys; 4; 3; 2; 1; 0 Girls ; 0; 1; 2; 3; 4 Families; 7; 50; 55; 32; 16 Let the probability of picking a boy or a girl be 1/2. Let P=boy, Q=girl. What is the probability - So far
So far on its tour, a band sold out 3 shows and did not sell out the other 3 shows. Considering this data, how many of the band's next 4 shows would you expect to be sold out? - Probability 83308
There are 10 parts in the box, 3 of them are defective. Let's choose 4 components at random. What is the probability that it will be among them a) 0 defective, b) just one defective component, c) just two defective components, d) exactly 4 defective compo - Probability 83267
The cube has 6 blue, 8 red, and 10 green balls. The player randomly draws 3 balls. Determine the probability that he draws balls of the same color.
- Probability 83133
The mobile PIN has 4 characters. What is the probability that the PIN contains the number 7 and ends with the number 5? - Probability 82744
Ten books are placed randomly on one shelf. Find the probability that certain three books are placed next to each other. - We randomly
We randomly select a three-digit number. What is the probability that the number 8 occurs at most once in its notation? - Probability 81679
What is the probability that a roll of three dice will result in a number less than 7? - Probability 81678
What is the probability of guessing a PIN code (4 numbers) if it contains only even numbers?
- Questions 81676
You will learn 50% of the 30 questions. If I get 4 questions, I'll know 3. - Probability 81637
We randomly select three different points from the vertices of a regular heptagon and connect them with line segments. The probability that the resulting triangle will be isosceles is equal to: (A) 1/3 (B) 2/5 (C) 3/5 (D) 4/7 - Probability 81446
What is the probability that each digit is different in a five-digit number? - Probability 81115
The probability of sprouting each avocado pit is 0.9. We planted 3 stones. What is the probability that exactly two of them will sprout? - Determine 79634
There are 12 apples and 10 pears in the basket. Peter has to choose either an apple or a pear from them so that Víra, who chooses 1 apple and 1 pear after him, has the greatest possible choice. Determine what Peter chooses.
- There 25
There are four red marbles and six blue marbles in a bag. What is the probability of picking up one blue marble and then one red marble? (assume that you keep the blue marble out of the bag) - Conditional 73664
I roll a 7-wall dice. What is the conditional probability that three fell if an odd number fell? - Probability 73654
We roll two dice. One is 6-walled, and the other is 8-walled. What is the probability that at least one unit will fall? - How many 23
How many times should a dice be rolled to obtain a most likely number of 2 points on it to be equal to 32? - Probability 73054
We roll six dice. What is the probability that: a) a six falls twice b) six falls four times
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