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Class A has 25 pupils and class B has 28 pupils. Both classes sit the same maths test. The mean score for class A is 69. The mean score for both classes is 41. What is the mean score in the maths test for class B?

Sagot :

Answer:

13

Step-by-step explanation:

Mean would mean average, which in this case is [tex]\frac{x+y}{2}[/tex]

so your equation would look like [tex]\frac{69+x}{2}=41[/tex]

Next multiply both sides by to clear the fraction [tex]2*(\frac{69+x}{2})[/tex]

to get [tex]69+x=89[/tex]

Subtract 69 from both sides [tex]69+x=82\\-69 -69[/tex]

you get [tex]x = 13[/tex]

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