Arithmetic mean =______

For an ungrouped data of 10 scores Arithmetic mean is 12. If one more score is joined to the previous scores the mean increases by 0.5 with this information. Ravi : Ravi says that the new score will be 0.5 more than 12. Harsha : Harsha says that the new score will be 5.5 more than 12. Ritu : Ritu says that sum of 11 scores is 17.5 greater than sum of 10 scores. Now, which of these is correct?

Marks of 12 students in a unit test are given as 4, 21, 13, 17, 5, 9, 10, 20, 19, 12, 20, 14, Assume a mean and calculate the arithmetic mean of the data. Assume another number as mean and calculate the arithmetic mean again. Do you get the same result? Comment.

AFLATOUN social and financial educational programme initiated savings programme among the high school children in Hyderabad district. Mandal wise savings in a month are given in the following table. Find arithmetic mean of school wise savings in each mandal. Also find the arithmetic mean of saving of all schools.

AFLATOUN social and financial educational program intiated savings program among the high school children in Hyderabad district. Mandal wise savings in a month are given in the following table. Find arithmetic mean of school wise savings in each mandal. Also find the arithmetic mean of saving of all schools.

Let A,G,H and S respectively denote the arithmetic mean, geometric mean, harmonic mean and the sum of the numbers a_1,a_2,a_3……..a_n . Then the value of x at which the function f(x)=sum_(k=1)^n(x-a_k)^2 has minimum is

For a group of 100 observations, the arithmetic mean and standard deviation are 8 and sqrt(10.5) respectively. The mean and standard deviation of 50 items selected from these 100 observations are 10 and 2 respectively. Then the standard deviation of the remaining 50 observation is