Question

11. The mean of 5 observations is 9. If the mean of
the first 3 observations is 6 and the mean of the
last 3 observations is 11. then the third
observation is
a) 6
b) 8
c) 9
d) 11
​

Answer 1

Answer:

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Step-by-step explanation:

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given :

time taken by mahesh to reach the maket from his house on his cycle is 15 minutes.

the speed of the cycle is 4 m/s.

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Answer 2

Answer:

Step-by-step explanation:

Given observations x,x+2,x+4,x+6,x+8

∵  

5

x+(x+2)+(x+4)+(x+6)+(x+8)

​  

=11

⇒  

5

5x+20

​  

=11

⇒x=7

So, the observations are 7,9,11,13,15

Req. mean =  

3

11+13+15

​  

=13