The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is:

  • Option 1)

    161

  • Option 2)

    162

  • Option 3)

    163

  • Option 4)

    164

  • Option 5)

    -

Answers (1)



Average\: height \: of \: 30\: boys = 160

sum = 160\ast 30 = 4800

Remaining\: boys = 20    

Average = 165

Sum = 165\ast 20 = 3300Average\: height \: of\: whole\: class = \left ( 4800+3300 \right )/50 = 8100/50 = 162

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