Average of data - Wiki

  • #averageofdata
    • The total height of 4 children is 546 cm. One of the children is 150 cm tall. What is the average height of the other 3 children? Ans: _BLANK_ cm
      • #averageofdata

        Total height of the other 3 children

        546 - 150 = 396 cm

        Average height of the other 3 chidren

        396 `-:` 3 = 132 cm 

    • The table below shows the registration fee for the various categories in a running competition. Mr Tan and his family participated in the competition.He and his wife participated in the 10-km and 5-km Run respectively. His two children participated in the Kids' Dash. How much did Mr Tan pay for each child if the average cost of registration for his family was $42.50? Ans: $_BLANK_
      • #averageofdata

        Total cost

        42.50 `xx` 4 = $170

        Cost of two children

        170 - 50 - 60 = $60

        Cost of each child (Kids' Dash)

        60 `-:` 2 = $30  

    • The table below shows the number of hours each student in a class of 30 students spent playing computer games per week. The average number of hours the students spent playing computer games per week was 5 hours. What is the missing number in the table? Ans: _BLANK_
      • #averageofdata

        `xx` 10 + 5 `xx` 15

        40 + 75 = 115

        Total hours

        `xx` 30 = 150

        Total hourse in the 7- hour group

        150 - 115 = 35

        The missing number is

        35 `-:` 5 = 7  

    • The total length of stick A and stick B is 9 m. Together with stick C, the average length of the three sticks is 6 m. What is the length of stick C?
      • #averageofdata

        Total length of 3 sticks

        `xx` 6 = 18cm

        Length of stick C

        18 - 9 = 9 m