The average height of 25 students in a class is 140 cm. five newly admitted students increase the average height by 1 cm. The average height of the set of 5 new student is
146.2 cm
147 cm
145 cm
146 cm
148 cm

• The average height of 25 students is 140cm
  total height of 25stdnts
  =25*140cm
  =3500cm
  add 5studnts avg height incrs 1cm...so
  30stdnts averge height is 141cm
  total height of 30stdnts
  =30*141cm
  =4230cm
  total height of 5stdnts=30stdnts total height-25stdnts total height
  =4230- 3500
  =730cm
  avg height of 5 stdnts
  =730/5
  =146cm
  
• 11 years agoHelpfull: Yes(7) No(0)
• 25+new students5=30
  140cm+1cm=141
  30*141=4230
  1studen=4230
  30*141-25*140=730
  avg height is 730/5=146cm
• 11 years agoHelpfull: Yes(2) No(0)
• The average height of 25 students is 140cm
  total height of 25stdnts
  =25*140cm
  =3500cm
  add 5studnts avg height incrs 1cm...so
  30stdnts averge height is 141cm
  total height of 30stdnts
  =30*141cm
  =4230cm
  total height of 5stdnts=30stdnts total height-25stdnts total height
  =4230- 3500
  =730cm
  avg height of 5 stdnts
  =730/5
  =146cm
  
• 11 years agoHelpfull: Yes(1) No(0)
• x/25 = 140 -> x = 3500
  (3500+y)/30 = 140+1 = 141
  y = 4230-3500 = 730
  ->avg ht of 5 stu is 730/5 = 144
• 11 years agoHelpfull: Yes(1) No(3)
• avg ht after adding 5 new student is increased to 141 i.e when 5 new students were added height increased by 30 student * 1 cm = 30 cm i.e 5 student added 30cm to avg i.e each student added 30/5=6cm hence avg height of 5 student will be 140+6=146cm
• 10 years agoHelpfull: Yes(1) No(0)