The required average score of the class is 68.
Given that,
A class of 25 students took a science test. 10 students had an average (arithmetic mean) score of 80.
The other students had an average score of 60, which is the average score of the whole class is to be detrmined.
The average of the values is the ratio of the total sum of values to the number of values.
Here,
The average of 10 students is 80,
The average of the remaining students is 60 i.e. = 25 - 10 = 15
Now an average of the class,
Average = 80 * 10 + 15 * 60 / 25
= 1700 / 25
= 68
Thus, the required average score of the class is 68.
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