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Class 10R sat a test. The mean mark of the class was 70%. There are 30 students in class 10R, 20 of whom are boys. The mean mark for the boys in the test was 62%.Work out the mean mark for the girls.

Respuesta :

86%

70X30=2100

20X62=1240

2100-1240 = 860

860/10=86

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Answer:

Mean mark for the girls is [tex]86%[/tex].

Step-by-step explanation:

Given information:

Number of total students in the class=[tex]30[/tex]

Number of boys in the class=[tex]20[/tex]

Then, number of girls will be=[tex]30-20[/tex]=[tex]10[/tex]

The mean mark of the class=[tex]70\times30=2100[/tex]

The mean mark for the boys is [tex]62[/tex]

Then, mark for the boys[tex]=62\times20=1240[/tex]

The mark for the girls=[tex]2100-1240=860[/tex]

Then mean mark of the girls will be  [tex]\frac{860}{10}=86[/tex]

Hence, mean mark for the girls is [tex]86%[/tex].

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