Question

. The average weight of a class of 60 students is 40kg.
if the weight of the teacher is also included, the aver-
age weight increases by 500 gm. The weight of the
teacher is?

Answer 1

Answer:

70.5

Step-by-step explanation:

average=sum of observations/no.of observation

given

total number of students=60

average = 40

therefore sum of observation= average * no of observations

                                                = 40*60

                                                = 2400 Kg

it is given that when teachers weight is also added the average increases by .5 kg.Therefore the new average = 40.5 and

the total number of observation = 61

therefore sum of observations = 40.5*61

                                                   =2470.5 Kg

the teacher weight = weight added= difference in sum of weight

                                =2470.5-2400

                                =70.5

Hope this was useful.....