Question

The mean weight of $8$ numbers is $15,$ if each number is multiplied by $2,$ what will be the new mean?

Answer 1

• Mean weight is 8 member is 15
  
• let x/8= 15
  
• x= 120
• if each no. multied by 2 then total weight will be 2x = 240
  
• so new mean 2x/8= 2*15 = 30