Fill in the blanks

(i) The difference between the maximum and minimum observations in a data is called the ………… of the data.

(ii) The number of observations in a class-interval is called the ………… of the interval.

(iii) The mid-point of a class-interval is called the ………… of the interval.

(iv) Lower-limit of the class-interval 24-30 is …………

(v) Upper limit of the class-interval 16-20 is …………

(vi) The class-mark of the class-interval is 20-30 is …………

(vii) The class-mark of the class-interval 9.5-19.5 is …………

Find the range of the data

(a) 5, 7, 16, 21, 8, 10

(b) 11, 13, 17, 14, 19, 14, 15, 18

State which of the following variables are continuous and which are discrete :

(i) Marks obtained by the students of a class in a test.

(ii) Daily maximum temperature of a city.

(iii) I.Q. of a students of a class.

(iv) Weights of players of a Volley-ball team.

(v) Number of car-accidents in a city.

(vi) Distance travelled by a train.

(vii) Time taken by runners in a race.

(viii) Sizes of shoes sold in a shoe-store.

(ix) Number of patients in a hospital per day.

Define the following terms:

(i) Variable

(ii) Class-interval

(iii) Class-size

(iv) Class-mark

(v) Class-limits

(vi) True class-limits

(Vii) Frequency of a class

(viii) Cumulative frequency of a class