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
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Answered by
4
Step-by-step explanation:
{(67.4×12)+(72.3×15)}÷(12+15)
{808.8+1084.5}÷27
1893.3÷27
70.12222 is your answer [:-)
Answered by
3
Answer:
70.12
Step-by-step explanation:
the mean of the marks scored by 12 students of a class is 67.4
=> Number of students = 12
& Mean Marks = 67.4
Total Marks by class = number of students * Mean Marks
=> Total Marks by class = 12 * 67.4 = 808.8
mean of another class consisting of 15 students is 72.3
=> Number of students = 15
& Mean Marks = 72.3
=> Total Marks by another class = 15 * 72.3 = 1084.5
Total Students in both Classes = 12 + 15 = 27
Total Marks by both classes = 808.8 + 1084.5 = 1893.3
Combined Mean = 1893.3 / 27 = 70.12
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