Question

The mean of 9 observation is 13. The mean of the first 5 observations is 11 and the mear
of last 5 observations is 14, then 5th observation is​

Answer 1

Hii

Step-by-step explanation:

Mean of 9 observations=13

therefore,sum of observations =13×9

=117

mean of first 5 observation=11

therefore,sum of observations

=11×5

=55

mean of last 5 observation=14

therefore,sum of observations

=14×5

=70

therefore,fifth observation

=(55+70)-117

=125-117

=8

ans..the fifth observation is 8.

Answer 2

Answer:

is given that Mean of 5 observations is 15.

∴  The sum of observations =15×5=75.

∴  It is given that mean of the first 3 observations is 14.

∴  The sum of first three observations =14×3=42.

⇒  Given that mean of the last 3 observations is 17.

∴  The sum of the last three observations =17×3=51

∴  The third observation =(42+51)−75

                                         =93−75

                                         =18