The mean age of 10 women in an office is 30 years old. The mean age of 10 men in an office is 29 years old. What is the mean age (nearest year) of all the people in the office?

30 years

Step-by-step explanation:

From the question, we are told that the mean age of 10 women in an office is 30 years old. This means that the total ages of the women in the office will be:

= 10 × 30 years

= 300 years

Also, the mean age of 10 men in an office is 29 years old. This means that the total ages of the men in the office will be:

= 10 × 29 years

= 290 years

Since there are 10 men and 10 women in the office, the number of people in the office is: 10 + 10 = 20 people. Also, the total ages will be: 300 + 290 = 590 years.

The mean age (nearest year) of all the people in the office will then be:

= 590/20

= 29.5 years

= 30 years approximately

< 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⭐