1.

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

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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