The marks of some students were listed out of 75, the S.D of marks was found to be 9, subsequently the marks were raised to a maximum of 100, and variance of new marks was calculated, the new variance

The marks of some students were listed out of a maximum 75. The SD of marks was found to be 9. Subsequently the marks were raised to a maximum of 100 and variance of new marks was calculated. The new variance is (1)144 (2) 122 (3) 81 (4) None of these

The marks of some students were listed out of 75. The standard deviation of marks was found to be 9. Subsequently the marks were raised to a maximum of 100 and variance of new marks was calculated. The new variance is (A) 144 (B) 122 (C) 81 (D) 75

The average marks of a student in seven subjects is 41. After re-evaluation in one subject the marks were changed to 42 from 14 and in remaining subjects the marks remained unchanged What are the new average marks? Options are (a) 45 (b) 44 (c) 46 (d) 47.

The average marks of 10 students is 30 if 6 marks is added with each students' marks.Then find the new average.

The marks of 3 students A, B and C are in the ratio 10:12:15. If the maximum marks of the paper are 100, then the marks o fB cannot be in the range of

Directions: In a Mathematics exam of 50 marks, there are five questions of 1 mark each, fifteen questions 2 mark each and 3 questions of 5 mark each. Given below is a table that shows number of correct answers of some students in different categories and then total marks out of 50. Some fields have been left as empty and then respective values needs to be calculated if the need arises. Based on this information, answer the questions that follow. Who scored maximum marks among the four students?