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Sagot :
The mean score of class B is 82. 92
How to determine the mean score
Class A = 30 pupils
Class B = 26 pupils
Mean score for class A = 70
Mean score of class B = unknown
Total mean score = 76
We have, [tex]\frac{(76 *( 30 + 26) - 70 *30) }{26}[/tex]
Then simply,
Calculate the sum or difference between the classes = [tex]\frac{76 * 56 - 70 * 30}{26}[/tex]
Calculate the product or quotient of the classes = [tex]\frac{4256 - 70 * 30}{26}[/tex]
= [tex]\frac{4256 - 2100}{26}[/tex]
= [tex]\frac{2156}{26}[/tex]
= [tex]\frac{1078}{13}[/tex]
= [tex]82. 92[/tex]
Thus, the mean score of class B is 82. 92
Learn more about mean score here:
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