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 144      2. 122      3. 81        4. 256       5. 16

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 12 students in a Math test are as follows: 8, 10, 4, 8, 5, 6, 9, 7, 6, 8, 9, 10 Find the: a maximum marks, b. minimum marks, c. range of marks, and d. mean marks.

The marks of 9 students in a test were 13,17,20,3,5,3,20,15 and 18. Find quartile deviation.

Out of 10 students, who appeared in a test, three secured less than 30 marks and 3 secured more than 75 marks. The marks secured by the remaining 4 students are 35, 48, 66 and 40. Find the median score of the whole group.

Out of 10 students, who appeared in a test, three secured less than 30 marks and 3 secured more than 75 marks. The marks secured by the remaining 4 students are 35, 48, 66 and 40. Find the median score of the whole group.

A student got the following marks in 9 questions of a question paper. 3,5,7,3,8,0,1,4 and 6. Find the median of these marks.

Marks obtained (in mathematics) by 9 students are given below: 60, 67, 52, 76, 50, 51, 74, 45 and 56 a. Find the arithmetic mean. b. If marks of each student be increased by 4, what will be the new value of arithmetic mean?

The sum of 100 observations and the sum of their squares are 400 and 2475 , respectively. Later on three observations 3,4 and 5, were found to be incorrect. if the correct observations are omitted. then the variance of the remaining observations is

Let mean of 100 data points be 55 and variance be 16. Now if every data point is increased by 2 units, then the sum of mean and standard deviation of new data points will be 70 2. 59 3. 63 4. 61 5. 55

For 50 students of a class, regression equation of marks in statistics (x) on marks in Accountancy (y) in 3y-5x+180=0 . The mean in Accoutancy is 44 and the variance of marks in statics is 9/16 of the varience of marks in Accountancy. Find the mean marks in Statistics and coefficient of correlation between marks in two subjects.