GRADE

N

Mean

Std. Deviation

Std. Error

95% Confidence Interval for Mean

Minimum

Maximum

Lower Bound

Upper Bound

group1

36

252.500

113.3302

18.8884

214.155

290.845

200.0

830.0

group3

32

201.656

70.1177

12.3952

176.376

226.936

10.0

291.0

Total

68

228.574

98.1726

11.9052

204.811

252.336

10.0

830.0