120 psychology students took a standardized test. The scores are summarized in the GFDT below. Scores Frequency 160 - 179 15 180 - 199 10 200 - 219 14 220 - 239 16 240 - 259 15 260 - 279 50 The scores are also described in the cumulative table shown below. Scores Frequency less than 180 15 less than 200 25 less than 220 39 less than 240 less than 260 70 less than 280 120 What is the missing value in the cumulative GFDT? answer =