what is the missing value

Question

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

Scores         Frequency
120 - 139	13
140 - 159	13
160 - 179	17
180 - 199
200 - 219	16
220 - 239	41

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

Scores         Frequency
less than 140	13
less than 160	26
less than 180	43
less than 200	63
less than 220	79
less than 240	nn

What is the missing value in the GFDT?

Answer 1

20

less than 200 = 63

less than 180 = 43

63-43 = 20 for 180 to 199