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प्रश्न
In a group of children, the mean marks of 4 boys is 80 and the mean marks of 6 girls is 85. The mean marks of the whole group is ______.
पर्याय
82.5
80
85
83
MCQ
रिकाम्या जागा भरा
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उत्तर
In a group of children, the mean marks of 4 boys is 80 and the mean marks of 6 girls is 85. The mean marks of the whole group is 83.
Explanation:
Mean marks of 4 boys is 80.
Total marks of boys = mean × number of boys
= 80 × 4
= 320
Mean marks of 6 girls is 85.
Total marks of girls = mean × number of girls
= 85 × 6
= 510
Total marks of the whole group = 320 + 510
= 830
Total number of Children = 4 + 6
= 10
Mean marks of the whole group = `"Total marks of the whole group"/"Total number of Children"`
= `830/10`
= 83
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