The mean weight of 8 students is 45.5 kg. Two more students having weights 41.7 kg and 53.3 kg joined the group. What is the new mean weight? - Sri Chaitanya Infinity Learn Best Online Courses for NCERT Solutions, CBSE, ICSE, JEE, NEET, Olympiad and Class 6 to 12

A
45.9
B
40
C
38.2
D
36

Solution:

Given the mean weight of 8 students is 45.5 kg.
The weight of two more students having weight 41.7 kg and 53.3 kg
We have to find the new mean weight
Just apply the formula of mean for 8 students
We know the mean is defined as the ratio of total sum of observation and the total number of observations.
On putting the given values
We get,

Multiplying 8 to LHS we will get the total weight of 8 students
So the total weight of 8 students

Now two more students joined the group
Therefore the total weight of all 10 students

New mean is,

Hence, the correct
Ans: is 45.9.
Hence, option 1 is the correct Ans:.

Solution:

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