Question

score on last try: 0 of 1 pts. see details for more. at least one scored part is incorrect. jump to first changable incorrect part. next question get a similar question you can retry this question below interpreting bar graphs bar graph with a, b, c, d on x - axis, percent on y - axis (10, 20, 30, 40), a and b bars at 30, c and d bars at 20 the bar graph above shows the percentage of students who received each letter grade on their last english paper. the class contains 90 students. how many students earned a c on their paper? 20 × students how many students earned a passing grade of c or higher on their paper? 80 × students

Explanation:

First Sub - Question: How many students earned a C on their paper?

Step1: Identify the percentage for grade C

From the bar graph, the percentage of students who earned a C is 20%.

Step2: Calculate the number of students with grade C

The total number of students is 90. To find the number of students with grade C, we use the formula: Number of students = (Percentage / 100) * Total number of students. So, for grade C, it is $\frac{20}{100}×90 = 18$.

Step1: Identify percentages for grades A, B, and C

From the bar graph, percentage for A is 30%, for B is 30%, and for C is 20%.

Step2: Calculate the total percentage for C or higher

Total percentage = 30%+30% + 20%=80%? Wait, no, wait. Wait, the total number of students is 90. Wait, no, let's recalculate. Wait, percentage for A: 30%, B: 30%, C: 20%. So total percentage for C or higher is 30 + 30+20 = 80%? Wait, no, wait, the number of students: for A: $\frac{30}{100}×90 = 27$, for B: $\frac{30}{100}×90 = 27$, for C: $\frac{20}{100}×90 = 18$. Then total for C or higher is 27 + 27+18 = 72. Wait, where did I go wrong earlier? Oh, right! The percentage for C is 20%, but when we calculate the number of students, we need to use the total number of students (90). So let's do it step by step.

Step1: Find number of students with A

Percentage for A is 30%, so number of students with A is $\frac{30}{100}×90 = 27$.

Step2: Find number of students with B

Percentage for B is 30%, so number of students with B is $\frac{30}{100}×90 = 27$.

Step3: Find number of students with C

Percentage for C is 20%, so number of students with C is $\frac{20}{100}×90 = 18$.

Step4: Calculate total for C or higher

Add the number of students with A, B, and C: 27+27 + 18=72.

Answer:

18

Second Sub - Question: How many students earned a passing grade of C or higher on their paper?