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 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 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.

If the standard deviation of a distribution is 9, what is the value of variance? (A) 18 (B) 27 (C ) 81 (D) 36

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

The average marks of a student in 4 subjects is 75. If the student obtained 80 marks in the fifth subject,then the new average is (a) 72.5 (b) 76 (c) 77 (d) 77.5

Given the marks of ten students , calculate standard deviation and coefficient of variation : 70 , 80 , 90 , 85 , 65 , 55 , 75 , 84 , 97 , 59