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प्रश्न
The average height of 10 students in a class is 105 cms. If 20 more students with an average height of 120 cms join them, what will be the average height be?
विकल्प
105 cms
110 cms
112 cms
115 cms
MCQ
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उत्तर
115 cms
Explanation:
Average height of 10 student = 105 cms
Average height of 20 student = 120 cms
Total Average height of 30 student
`=(10xx105+20xx120)/30`
= 115 cm
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