Question

The mean weight of a group of 10 items is 29 and that of another group of n items is 3.The mean of combined group of 10+n items is found to be 30.The value of n is​

Answer 1

Step-by-step explanation:

mean weight of 10 items =29

sum of 10 items =290

mean of n items = 3

sum of n items =3n

mean of 10+n items =30

sum of 10+n items = 30(10+n) = 300+30n

290+3n=300+30n

27n=-10

n=-10/27

guess the numbers of one of them is wrong as n cant be negative

tried to solve, got n as negative which is not valid as n is no. of items

hope this helps