Question

The number observation between 150 and 200 =?

Answer 1

Step-by-step explanation:

Mean of 200 observations = 150

Sum of 200 observations = 200×150=30000

Mean of 300 observations = 100

Sum of 300 observations = 300×100=30000

Total Sum = 30000+30000=60000

Number of observations = 100+200=500

Mean =

Numberofobservations

Sum

=

500

60000

=120