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Class 10 R sat a test.
The mean mark for the class was .
There are 30 students in class of whom are boys.
The mean mark for the boys in the test was .
Work out the mean mark for the girls.

Ask by Ellis Wells. in the United Kingdom
Jan 21,2025

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The mean mark for the girls is 86%.

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To find the mean mark for the girls in Class 10 R, we can use the information provided about the overall mean and the mean for the boys.
  1. Calculate the total marks for the class:
    The mean mark for the class is with 30 students.
  2. Calculate the total marks for the boys:
    The mean mark for the boys is with 20 boys.
  3. Calculate the total marks for the girls:
    There are 30 students in total, and 20 are boys, so there are girls.
    We can find the total marks for the girls by subtracting the total marks of the boys from the total marks of the class.
  4. Calculate the mean mark for the girls:
    Now we can find the mean mark for the girls by dividing their total marks by the number of girls.
Therefore, the mean mark for the girls is .

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