Marks obtained by Vinay in Unit Tests of 50 marks are

They probability that Vinay gets marks above 56% in a unit test is :

66%

56% of 50 = 28

Total marks obtained more than 28 = 4 units

Total number of units = 6

probability that Vinay gets marks above 56% in a unit test is = \(\frac{ 4 }{6}\)

= 66.67%

The correct answer is option (3) : 66%