The enrolment in a school during six consecutive years was as follows: 1555,1670,1750,2013,2540,2820. Find the mean enrolement of the school for this period.

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.

Which of the following are primary 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.

Total number of students of a school in different years is shown in the following table B Prepare another pictograph of students using any other symbol each representing 50 students. Which pictograph do you find more informative?

The following table shows the ages of the patients admitted in a hospital during a year: Find the mode and the mean of the data given above. Compare and interpret the two measures of central tendency.

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.

On annual day of a school, 400 students participated ln the function. Frequency distribution showing their ages is u shown in the following table : Find mean and median of the above data.

Let X denote the number of hours you study during a randomly selected school day. The probability that X can take the values x, has the following form, where k is some unknown constant. P(X=x)={{:(0.1, "if "x =0),(kx, "if "x = 1 or 2 ),(k(5-x), "if " x=3 or 4),(0,"otherwise"):} (a) Find the value of k. (b) What is the probability that you study at least two hours ? Exactly two hours? At most two hours?

Let X denote the number of hours you study during randomly selected school day to probability that X can take the values of x, has the following form. P(X=x) = {{:(0.1, If x=0),(kx, if x=1 or 2),(k(5-x), if x =3 or 4),(0, " otherwise "):} find the value of k