please help answer q-11 with method
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with method please
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Sum of marks of all students = 72 × 100 = 7200
Sum of marks of boys = 75 × 70 = 5250
Sum of marks of girls = 7200 - 5250 = 1950
Number of girls = 100 - 70 = 30
Mean mark of girls = 1950/30 = 65
Option (2)
Sum of marks of boys = 75 × 70 = 5250
Sum of marks of girls = 7200 - 5250 = 1950
Number of girls = 100 - 70 = 30
Mean mark of girls = 1950/30 = 65
Option (2)
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Given that total number of students = 100.
Given that there are 70 boys in the class.
Number of girls = 100 - 70
= 30.
Given that Mean marks of 100 students in a class was 72.
= > 100 * 72
= > 7200.
Given that Mean of marks for boys was 75. The total number of boys = 70.
= > 70 * 75
= > 5250.
That means mean of marks of girls = 7200 - 5250
= 1950.
Therefore, the average marks of girls = Mean Marks of girls/Number of girls
= 1950/30
= 65.
Hope this helps!
Given that there are 70 boys in the class.
Number of girls = 100 - 70
= 30.
Given that Mean marks of 100 students in a class was 72.
= > 100 * 72
= > 7200.
Given that Mean of marks for boys was 75. The total number of boys = 70.
= > 70 * 75
= > 5250.
That means mean of marks of girls = 7200 - 5250
= 1950.
Therefore, the average marks of girls = Mean Marks of girls/Number of girls
= 1950/30
= 65.
Hope this helps!
:-)
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