The mean of discrete observations `y_(1), y_(2), …, y_(n)` is given by

The mean of discrete observation y_1, y_2,…y_n is given by

If the standard deviation of n observation x_(1), x_(2),…….,x_(n) is 5 and for another set of n observation y_(1), y_(2),………., y_(n) is 4, then the standard deviation of n observation x_(1)-y_(1), x_(2)-y_(2),………….,x_(n)-y_(n) is

If the standard deviation of n observation x_(1), x_(2),…….,x_(n) is 5 and for another set of n observation y_(1), y_(2),………., y_(n) is 4, then the standard deviation of n observation x_(1)-y_(1), x_(2)-y_(2),………….,x_(n)-y_(n) is

The geometric mean of the observation x_(1),x_(2),x_(3),……..,_(n) is G_(1) , The geometric mean of the observation y_(1),y_(2),y_(3),…..y_(n) is G_(2) . The geometric mean of observations (x_(1))/(y_(1)),(x_(2))/(y_(2)),(x_(3))/(y_(3)),……(x_(n))/(y_(n)) us

The standard deviation of n observation x_(1),x_(2),……x_(n) is 6. The standard deviation of another set of n observations y_(1),y_(2),………..y_(n) is 8. What is the standard deviation of n observations x_(1)-y_(2),x_(2)-y_(2),………..,x_(n)-y_(n) ?

The mean square deviation of a set of m observations y_1, y_2…..y_m about a point K is defined as 1/m sum_(i = 1)^(m) (y_i - k)^(2) . The mean square deviation about -3 and 3 are 16 and 8 respectively, then standard deviation of this set of observation?