Calculating % of Students with C or C+ in Exam | Probability Question

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In the exam results, 15% of students achieved at least a "B," while 65% scored at least a "C-," indicating that 35% scored below a "C-." Additionally, 45% of students received less than a "C," which helps clarify the distribution of scores. To find the percentage of students who received a "C" or "C+," one must consider the overlap between those scoring below a "C" and those scoring at least a "C-." By analyzing these percentages, it becomes evident that the calculations can be simplified to determine the specific percentage of students achieving a "C" or "C+." Understanding these relationships is crucial for accurately interpreting the exam results.
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The results of a exam had 15% of students earning atleast a "B", 65% with atleast a "C-", and 45% with less than a "C". What % of the students received a "C" or a "C+"?

The whole less than C and atleast C- thing is throwing me off and I can't seem to wrap my head around it.

Any help would be greatly appreciated.

Thanks
 
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Try thinking of it like this, if 65% of people got a C or higher, then what percentage got lower than a 'C' (hint: the total of the two must give 100%, since it covers the whole range). Now, using the other value quoted, namely 45%, what is the percentage between the two?:wink:

(no. of people with < C) + (no. of people with >= C) = (Total number of people involved)
 

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