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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