1.

If the mean of the observation x , 2x+1 , 2x+5 , 2x+ 9 is 30 what is the mean of last to observations ?

Answer»

x+2x+1+2x+5+2x+9=30*4

7x+15=120

x=105/7

x=15

last TWO OBSERVATIONS are 2x+5 and 2x+9

=14+5 and 14+9

mean=(19+23)/2

mean=42/2=21



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