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Class A has 26 pupils and class B has 15 pupils.
Both classes sit the same maths test.
The mean score for class A is 33.
The mean score for both classes is 39.
What is the mean score (rounded to 1 DP) in the maths test for class B?

Respuesta :

jesusm1

Answer:

Concept: Real World Analysis

  1. So we know A has an average of 33
  2. We know A+B/2= 39
  3. Hence we will solve for b
  4. [tex] \frac{33 + x}{2} = 39[/tex]
  5. [tex]x = 45[/tex]
Dilshat

Answer:

It's 49.4

Step-by-step explanation:

((26*33)+(15*x))/41＝39

((858)+(15*x))/41＝39 ‖*41

(858)+(15*x)＝1599 ‖-858

15*x＝741 ‖/15

x＝49.4

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