Question

If the mean of the observation x,x+3,x+5,x+7and x+10 is 9 then mean of the first three observations is ​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

mean of the observation x,x+3,x+5,x+7,x+10 is 9

so,

(x+x+3+x+5+x+7+x+10)/5=9

=> 5x+25=9×5=45

=> 5x=45-25=20

=> x=20/5=4

mean of the first three observation is

(x+x+3+x+5)/3

=(3x+8)/3

=(3×4+8)/3 [putting x=4]

=(12+8)/3

=20/3

=6 2/3