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To find the probability that a randomly chosen student earned a B, we need to use the data from the table.

### Step-by-step solution:

1. **Total number of students**: This is the total sum of all grades, which is given as 55.
2. **Number of students who earned a B**: The total number of students who earned a B is the sum of both males and females who earned a B, which is 12 (males) + 5 (females) = 17.

The probability is the ratio of students who earned a B to the total number of students:

\[
P(B) = \frac{\text{Number of students who earned a B}}{\text{Total number of students}} = \frac{17}{55}
\]

3. **Calculate and round to three decimal places**:

\[
P(B) = \frac{17}{55} \approx 0.309
\]

### Final Answer:
The probability that a randomly chosen student earned a B is **0.309**.

Do you want more details or have any other questions?

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Here are 5 related questions to explore:
1. What is the probability that a randomly chosen student is male?
2. What is the probability that a student earned an A?
3. What is the probability that a student is female and earned a C?
4. What is the probability that a student earned a C, regardless of gender?
5. What is the probability that a male student earned an A?

**Tip**: Always verify the sum of the individual components to ensure they match the total when calculating probabilities from a table.

If a student was randomly chosen, find the probability that the student earned a B. Round your answer to three decimal places.

Learn how to calculate the probability that a randomly chosen student earned a B in a class of 55 students, with a detailed step-by-step guide. The solution uses basic probability formulas and provides a thorough understanding of the concept, suitable for college students.

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