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The mean of the marks scored by 12 students of a class is 67.4. If the mean of another class consisting of 15 students is 72.3, find their combined mean?1). 70.122). 69.853). 71.234). 68.94 |
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Answer» MEAN of the CLASS consisting of 12 STUDENTS = 67.4 Mean of the class consisting of 15 students = 72.3 Combined mean$(\; = \frac{{12 \TIMES 67.4 + 15 \times 72.3}}{{12 + 15}} = 70.12)$ |
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