Question

the mean weight of 9 persons is 52 kg .if one of the persons weighing 56kg leaves , the new average will be

Answer 1

Mean of 9 persons=52

mean= sum of total observation/no. of observation

Mean of 9 person= sum of 9 personsweight /9
52=sum of 9 persons weight/9

sum of 9 persons weight=52×9
Sum of 9 persons weight= 468

IF 1 PERSON OF 56 Kg LEFT
Then,

Total sum of 8 persons weight= sum of 9 person weight - 1 person weight

Total sum of 8 persons weight= 468-56
Total sum of 8 persons weight= 412

Now new average= sum of 8 persons weight/8
Average= 412/8
Average= 206/4
Average=103/2
Average=51.5

HOPE IT HELPS YOU!

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Answer 2

hope it helps you enjoy.....