Respuesta :

mhanifa

Answer:

  • c) 11.5

Step-by-step explanation:

Total frequencies:

  • 6 + 15 + 20 + 7 + 2 = 50

Median group is the containing the middle - 25th and 26th frequencies. This is the 11-15 interval.

Estimated median formula:

  • Estimated Median = L +  ((n/2) − B)/G* w, where
  • L -  lower class boundary of the group containing the median = 10.5
  • n -  total number of values = 50
  • B - cumulative frequency of the groups before the median group = 6 + 15 = 21
  • G -  frequency of the median group = 20
  • w -  group width = 5

Substitute values and work out the number:

  • Estimated Median = 10.5 + (50/2 - 21)/20*5 = 11.5

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