The mean of 10 girls of a class is 138cm and mean height of 40 boys is 144cm find mean of 50 students of the class
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Answer:
142.8 cm
Step-by-step explanation:
Mean = Sum of observations / No. of observations
Sum of observations = Mean * No. of observations
Mean height of 10 girls = 138 cm
=> Sum of heights of 10 girls = 10*138 = 1380 cm
Mean height of 40 boys = 144 cm
=> Sum of heights of 40 boys = 40*144 = 5760 cm
Total height of all 50 students = 7140 cm
Mean height of 50 students = 7140/50 = 142.8 cm
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