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48. The average height of 20 boys is 120 cm and theaverage height of 10 girls is 117 cm. Find the aver-age height of these 30 students. |
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Answer» the average height will be 7.9 120+117/30=237/2=118.5 cm The total average height of these 30 students = The average of boys + the average of girls-------------------------------------------- total no. of student = 120+117 ----------------- 30 = 237 -------- 30 = 7.9 the average height will be 7.9 20*120=240010*117=11702400+1170=3570So 3570/30=119cm |
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