Question 58039: seniors performnd the same experiment on three groups of subjects and obtained mean scores of 84, 69, and 76. The groups consisted of 13, 31, and 27 subjects respectivly. What is the overall mean for all subjects to 2 decimal places?
Answer by venugopalramana(3286)   (Show Source):
You can put this solution on YOUR website! seniors performnd the same experiment on three groups of subjects and obtained mean scores of 84, 69, and 76. The groups consisted of 13, 31, and 27 subjects respectivly. What is the overall mean for all subjects to 2 decimal places?
TOTAL SCORE OF GROUP1 = MEAN*NUMBER OF SUBJECTS=84*13=1092
....................2 =........................=69*31=2139
....................3 =........................=76*27=2052
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TOTAL................................................= 5283
TOTAL SUBJECTS = 13+31+27=71
MEAN.................................=5283/71=74.408=74.41
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