1)
Total Marbles = 7
Red Marbles=3
So probably of 1st red pull is 3 / 7
As the marble is again returned to the box, probablity of second red pull is also 3 /7
As both of these are mutually exclusive actions, probablity of them occuring together will be 3 / 7 * 3 / 7 = 0.1837
Similarly, Blue Marbles =4
So probably of 1st blue pull is 4 / 7
As the marble is again returned to the box, probablity of second blue pull is also 4 /7
As both of these are mutually exclusive actions, probablity of them occuring together will be 4 / 7 * 4 / 7 = 0.3265
Therefore p ( both marbles same colour) = 0.1837 + 0.3265 = 0.5102
2) Given that, n = 200, O blood group people count = 70
p (person has O blood type) = 70 / 200 = 0.35
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