1.

The sum of (3x+5) observation is 9x²-30x+25 .Find the mean of the observation​

Answer»

Answer:

Mean = SUM of all OBSERVATIONS/

total number of observations

mean = 9x^2- 30X+ 25 / 3x+5

mean=3x-15/90

90+15=3x

x=105/3

x=35



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