Question

the mean weight of 20 students is 25kg and the mean weight of another 10 students is 40kg.find the mean weight of the 30 students ​

Answer 1

Answer:

30

Step-by-step explanation:

total weight of 20 students = 25 * 20

                                             = 500

total weight of 10 students  =  40 * 10

                                             =  400

Therefore,

total weight of all 30 students = 500 + 400

                                                  = 900

Now,

Mean weight of 30 students = 900/30

                                               = 30