The mean weight of a class of 20 students is 48 kg. Two more students weighing 60kg and 58kg
respectively join the class. What is the mean weight of the class now?
answer with explanation.
Answers
Answer:
49
Step-by-step explanation:
let the students weight be...
x1,x2,x3... and so on
So Mean will be
(x1+x2+x3...+x20)/20=48
x1+x2+x3...+x20=960
New students weight=60+58=118
New weight of class=1078
Mean=
1078/20+2
1078/22
49 is the answer
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To find: We have to find the mean weight of class.
Answer:
Mean weight of students in classroom is 49 kg.
Step-by-step explanation:
Given that,
Mean of weight of 20 students in class = 48
∴ Sum of mean of weight of 20 students = 48 × 20
= 960
Two more students weighing 60kg and 58kg join the class.
∴ Total number of students in class = 20+2 = 22
Total weight in classroom = 960 + 60 + 58 = 1078
∴ Sum of weight of mean in classroom = 1078/22
= 49
Therefore, Mean weight of classroom is 49 kg.
Explanation:
In this question, The mean weight of 20 students in class is given as 48kg. So, We first find the sum of mean of weight of 20 students in class and we get 960. Two more students weighing 60 and 58 kg were joined to classroom. Therefore, Now total number of students in classroom are 22. Now, We find the sum of mean of weight of 22 students. And we get the value 1078. Dividing it by 22 gives us the result 49. Hence, The mean weight of classroom students is 49kg.