3)
1,4,5,5, 8, 9, 11,3,9,4,5
Mean
Median
mode

Below in bold.

Step-by-step explanation:

Arrange in ascending order:

1, 3, 4, 4, 5, 5, 5, 8, 9, 9, 11.

The median ( the middle value) = 5.

The mode (the most frequent number) = 5.

The mean = ( the sum of  1, 3, 4, 4, 5, 5, 5, 8, 9, 9, 11) / 11 =  64/11

= 5.82.

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

practice. practice. practice.