The scores (grads) of students in computer lab are S1, S2, S1, S3, S2, S2, S4, S4, S4, S1, S2, S3, S3, S5, S2, S3, S1, S1, S1, S2, S3, S3, S5, S5, S5, S2, S3, S4 and S2, where S1 high score while S5 low score.

The mean of scores is

A

S1

B

S2

C

S5

D

Not exist

(22) The median of scores is

A

S1

B

S2

C

S5

D

S4

(23) The mode of scores is

A

S1

B

S2

C

S5

D

S4