Mean of a class of 35 students in a mathematics class test was 15. A chance was given to improve marks of those students who score less than 8. 3 students scored 3, 5&6.when the test was again conducted after a remedial class they scored 7, 10, 12. What will be the new mean of the class
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Shaina1254:
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According to question
Initial mean = 15
Thus Total marks obtained = 3+5+6 +x
Thus
3+5+6+x / 35 = 15
14 + x = 525
x = 511
Thus New mean
Mean = x + 7 + 10 + 12 / 35
Mean = 511 + 29 / 35
Mean = 15.42
Thus the mean will be 15.42
Initial mean = 15
Thus Total marks obtained = 3+5+6 +x
Thus
3+5+6+x / 35 = 15
14 + x = 525
x = 511
Thus New mean
Mean = x + 7 + 10 + 12 / 35
Mean = 511 + 29 / 35
Mean = 15.42
Thus the mean will be 15.42
wrong answer.
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