Which of the following are primaryt and secondary data ?
(i) Collection of the data about enrollment of students in your school for a period from 2001 to 2010.
(ii) Height of students in your class recorded by physical education teacher.

In a particular section of class IX, 40 students were asked about thhe months of their birth the following graph was prepared for the data so obtained . Find the probability that a student of the class was born in August.

The Class X students of a secondary school in Krishinagar have been alloted a rectangular plot of land for their gardening activity . Sapling of Gul mohar is planted on the boundary at a disatnce of 1m from each other . There is a triangular grassy lawn in the plot as shown in the figure . The students are to sow seeds of flowering plants on the remaining area of the plot . (i) Taking A as origin , find the coordinates of the vertices of the triangle . (ii) What will be the coordinates of the vertices of Delta PQR if C is the origin Also calculate the areas of the triangles i these cases . What do you observe ?

A student studying the force experienced by a current-carrying conductor in a magnetic field records the following observations : [i] The force experienced by the conductor increases as current is increased. [ii] The force experienced by the conductor decreases as the strength of the magnetic field is increased. Which of the two observations is correct and why?

The following distribution gives the state-wise teacher-student ratio in higher secondary schools of India. Find the mode and mean of this data. Interpret the two measures.