Question

Question 8.
In a dass, there are 50 students. Out of these,
30 are girls and 20 are boys. The mean weight
of the girls is 45 kg and that of boys is 52 kg.
Find the mean weight of all the students of the
class​

Answer 1

Answer:

The average weight of entire class is 49.2 kg.

Step-by-step explanation:

Since we have given that

Number of students = 50

Number of girls = 20

Number of boys = 30

Mean of girls = 45 kg

Mean of boys = 52 kg

So, According to question, the mean weight of entire class is given by

20 X 45 +30 X 52 / 50

= 2460/ 50

= 49.2 kg

Hence, the average weight of entire class is 49.2 kg.

Step-by-step explanation:

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Answer 2

Answer:

49.8 kg

Total weight of girls = 30*45 = 1350 kg

Total weight of boys = 20*52 =1040 kg

So, total weight of all students = 1350 + 1040 = 2490 kg

Mean weight of all students = 2490/50 = 49.8 kg