Question

2. There are 30 boys and 60 girls in a class. If the
average age of boys is 12 year and the average age
of girls is 10 year, then find the average age of the
whole class.​

Answer 1

Answer:

(12 × 30) + ( 10 × 60) / 90

= 360 + 600/90

= 960/ 90 = 10.67 years

Step-by-step explanation:

mean = sigma x / N so sigma x = mean × N

Answer 2

Answer:

960

Step-by-step explanation:

30 জন ছেলের total বয়স 360

60 জন মেয়ের total বয়স 600

Whole class average age 960