Median of a data , arranged in ascending order 7,10,15,x,y,27,30 is 17 and when one more observation 50 is added to the data, the median has become 18 . Find x and y.

A fraction becomes (8)/(11) if 3 is added to both the numerator and the denominator also if 3 is substracted from the numerator and the denominator it becomes (2)/(5) . Find the fraction . OR 10 years hence the age of x will be 2 times that of age of y 10 years ago the age of x was six times that of age of y . what are their present ages ?

Find the values of x and y, if the median for the following data is 31.

Find the mean deviation about the median for the following data 3, 9, 5, 3, 12, 10, 18, 4, 7, 19, 21.

Find the mean deviation about the median for the data in 13, 17, 16, 14, 11, 13, 10, 16, 11, 18, 12, 17

The following observations have been arranged in ascending order. If the medium of the data is 63, find the value of x. 29,32,48,50,x,x+2,72,78,84,95

A class has 15 students whose ages are 14, 17, 15, 14, 21, 17, 19, 20, 16, 18, 20, 17, 16, 19 and 20 years. One student is selected in such a manner that each has the same chance of being chosen and the age X of the selected student is recorded. What is the probability distribution of the random variable X? Find mean, variance and standard deviation of X.

Two concentric circular coils X and Y of radii 16 cm and 10 cm respectively, lie in the same vertical plane containing the north to south direction. Coil X has 20 turns and carries a current of 16A, coil Y has 25 turns and carries a current of 18A. The direction of the current in X is anticlockwise and is clockwise in Y, for an observer looking at the coils facing west. Give the magnitude and direction of the net magnetic field due to the coils at their centre.