D
Average = Sum of observations/Number of observations
Given, average score in a bank examination of 13 students of a class is 50.
Sum of total scores = 13 × 50= 650
Given, if the scores of the top five students are not considered, the average score of the remaining students
falls by 5.
Sum of scores of remaining 8 students = 8× 45= 360
Sum of scores of the top 5 students = 650-360= 290
Let the scores of the top 5 students be a, b, c, d and e.
Let ‘e’ be the maximum possible score of the topper.
Also, each of the top five scorers had distinct integral scores.
Thus, for ‘e’ to be the maximum possible score, the collective score of (a + b + c + d. should be least possible.
Since average given was 45, so minimum score for highest scorers will be 46 atleast.
Thus,
a = 46, b = 47, c = 48, d = 49
⇒a + b + c + d + e = 290
⇒46+ 47 + 48+ 49 +e = 290
⇒e = 100