Asked by supersupersuper
                Mr brown gives his class a test.
The 10 girls in the class get a mean mark of 70 percent.
The 15 boys in the class get a mean mark of 80 percent.
Nick says that because the mean of 70 and 80 is 75 then the mean mark for the whole class in the test is 75 percent.
Nick is not correct.
Is the correct mean mark less than or greater than 75 percent.
You must justify your answer!
Please answer question above i have no clue but as i have to show my work, here it is:
There are more girls than boys not an equal amount of girls and boys so the mean cannot be the middle number of 70 and 80.
Please answer and quickly with step by step clear help.
            
        The 10 girls in the class get a mean mark of 70 percent.
The 15 boys in the class get a mean mark of 80 percent.
Nick says that because the mean of 70 and 80 is 75 then the mean mark for the whole class in the test is 75 percent.
Nick is not correct.
Is the correct mean mark less than or greater than 75 percent.
You must justify your answer!
Please answer question above i have no clue but as i have to show my work, here it is:
There are more girls than boys not an equal amount of girls and boys so the mean cannot be the middle number of 70 and 80.
Please answer and quickly with step by step clear help.
Answers
                    Answered by
            supersupersuper
            
    please quickly answer i need to know this quick to explain to the class
    
                    Answered by
            :)
            
    Isn't it 70 + 80 = 150
150 / 2 = 75 ?
    
150 / 2 = 75 ?
                    Answered by
            :)
            
    Or maybe 70% (0.7) x 80% (0.8) = 0.56
0.56 / 2 = 0.28
So probably 28 percent?
    
0.56 / 2 = 0.28
So probably 28 percent?
                    Answered by
            supersupersuper
            
    any tutors out there know?
    
                    Answered by
            supersupersuper
            
    i mean the exact method and answer??
    
                    Answered by
            Anonymous
            
    girls- 10 x 70 = 700
boys- 15 x 80 = 1200
700+1200 = 1900
1900/25 = 76%
76% is more than 75%
so the answer is more than
    
boys- 15 x 80 = 1200
700+1200 = 1900
1900/25 = 76%
76% is more than 75%
so the answer is more than
                    Answered by
            eimy 
            
    girls- 10 x 70 = 700
boys- 15 x 80 = 1200
700+1200 = 1900
1900/25 = 76%
76% is more than 75%
so the answer is more than
im not a teacher but i think this is the answer
im in year 9 by the way!
    
boys- 15 x 80 = 1200
700+1200 = 1900
1900/25 = 76%
76% is more than 75%
so the answer is more than
im not a teacher but i think this is the answer
im in year 9 by the way!
                    Answered by
            Anonymous
            
    cheers bro
    
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