Math Problem Statement

What is the probability of each case listed below when selecting an integer from 1 to 10 at random?

Solution

To answer the question in the uploaded image:

The question asks about probabilities related to selecting an integer from 1 to 10 at random for various cases. Here’s the solution for each:


  1. An odd number:
    • Odd numbers between 1 and 10: {1, 3, 5, 7, 9}.
    • Total = 5.
    • Probability = Favorable outcomesTotal outcomes=510=12\frac{\text{Favorable outcomes}}{\text{Total outcomes}} = \frac{5}{10} = \frac{1}{2}.

  1. Greater than 7:
    • Numbers greater than 7: {8, 9, 10}.
    • Total = 3.
    • Probability = 310\frac{3}{10}.

  1. An even number and greater than 5:
    • Even numbers greater than 5: {6, 8, 10}.
    • Total = 3.
    • Probability = 310\frac{3}{10}.

  1. A multiple of 3:
    • Multiples of 3 between 1 and 10: {3, 6, 9}.
    • Total = 3.
    • Probability = 310\frac{3}{10}.

  1. A prime number:
    • Prime numbers between 1 and 10: {2, 3, 5, 7}.
    • Total = 4.
    • Probability = 410=25\frac{4}{10} = \frac{2}{5}.

Probability summary for the cases:

  1. 12\frac{1}{2}
  2. 310\frac{3}{10}
  3. 310\frac{3}{10}
  4. 310\frac{3}{10}
  5. 25\frac{2}{5}

Let me know if you need further clarification or additional questions! Here are 5 related questions for practice:

  1. What is the probability of selecting a number divisible by 2 or 5 from 1 to 10?
  2. How many outcomes satisfy both "greater than 7" and "an odd number"?
  3. If you randomly choose two numbers from 1 to 10, what is the probability both are even?
  4. What is the probability of selecting a number less than 4?
  5. Are the events “odd number” and “greater than 7” mutually exclusive?

Tip: Remember to always double-check the conditions of probability questions to ensure correct outcomes are counted!

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Math Problem Analysis

Mathematical Concepts

Probability
Number Theory

Formulas

Probability = Favorable outcomes / Total outcomes

Theorems

Basic Probability Rules

Suitable Grade Level

Grades 6-8