Question

 psychology students took a standardized test. The scores are summarized in the GFDT below.

      Scores          Frequency   
180 - 199 11
200 - 219 18
220 - 239 12
240 - 259  
260 - 279 13
280 - 299 52



The scores are also described in the cumulative table shown below.

      Scores          Frequency   
less than 200 11
less than 220 29
less than 240 41
less than 260 55
less than 280 68
less than 300 nn



What is the missing value in the GFDT?

answer = 

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