100 surnames were randomly picked up from a local telephone directory and a frequency distribution of the number of letters in the English alphabet in the surnames was found as follows:

(i) Draw a histogram to depict the given information, (ii) Write the class interval in which the maximum number of surnames lie.

In a particular section of Class IX, 40 students were asked about the month of their birth and the following graph was prepared for the data so obtained : Observe the bar graph given above and answer the following questions: ( i ) How many students were born in the month of November? (ii) in which month were the maximum number of students born ?

Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows: (i) Make a grouped frequency distribution table for this data, taking class width 5 and one of the class intervals as 5 - 10. (ii) How many children watched television for 15 or more hours a week ?

The heights of 50 students, measured to the nearest centimetres, have been found to be as follows: (i) Represent the data given above by a grouped frequency distribution table, taking the class intervals as 160 - 165,165-170, etc. (ii) What can you conclude about their heights from the table ?

On one page of a telephone directory , there were 200 telephone numbers . The frequency distribution of their unit place digit (for example , in the number 25828573 , the unit place digit is 3 ) is given in the following table . {:("Digit",0,1,2,3,4,5,6,7,8,9),("Frequency",22,26,22,22,20,10,14,28,16,20):} Without looking at the pencil is placed on one of these numbers, i.e., the number is chosen at random. What is the probability that the digit in its unit place is 6 ?