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 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 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 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 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.

(a)The scores of 10 students in a test, in which the maximum marks were 50 as follows : 28,36,34,28,48,22,35,27,19,41 Find the variance . (b)Latter on the maximum marks were increased to 100 , and accordingly each students score was doubled . Find the variance of the new scores.

In an examination,a student had to obtain 33% of the maximum marks to pass.He got 125 marks and failed by 40 marks.The maximum marks were

In a test a candidate secured 336 marks out of maximum marks 'x'. If the maximum marks 'x' were converted into 400 marks he would have secured 192 marks. What were the maximum marks of the test?

In a test, a candidate secured 468 marks out of maximum marks 'A'. If the maximum marks 'A' were converted to 700 marks, he would have secured 336 marks. What were the maximum marks of the test ?