plz answer 23rd one.........
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given observations :45,52,60,x,69,70,26,81,96
mean of the observation is 68
mean =sum of observations / no of observations
68=45+52+60+x+69+70+26+81+94/9
68=497+x/9
68*9=497+x
612=497+x
612-497=x
115=x
∴x is 115
hope it is correct
mark as brain list please........
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