class

mean

N

standard deviation

class one

76.4063

16

8.51316

class two

87.7500

20

9.83081

class three

80.3333

15

12.42358

class four

80.3333

15

12.35150

class five

86.8182

11

10.00568

class six

80.4688

16

8.02178

class seven

80.7813

16

8.50092

class eight

85.5556

9

9.74501

total

82.1398

118

10.42000