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(iii) 14 students spent more than hours in watching TV. The number of students who watched TV for >5 hours =  number of students who watched TV for (5 – 6 hours) + (6 – 7 hours). So the no. of students = 8 + 6 = 14
(ii) 34 students watched TV for less than hours. The number of students who watched TV for less than 4 hours = sum of  the students who watched TV for (3–4hours) + (2–3hours) + (1–2hours.) So, the total number of students = 4 + 8 + 22 = 34
(i) From the graph we observed that the maximum number of students (32) watch TV for 4-5 hours.
(iii) The workers earning less than   are . 3 + 2 + 1 + 9 + 5 = 20
(ii) The workers earning   and more are 1 + 3 + 1 +1 + 4 = 10
(i) The group which has the maximum number of workers is
Using tally marks a frequency table with intervals as 800–810, 810–820 and so on  is as shown : . Intervals Tally MARKS Frequency
The frequency distribution table using tally marks is as shown : Shopper Tally marks      Number of shoppers      W           28      M           15      B            5      G           12               60   The graph is as shown :
(d) The number of passengers boarding trains from to at a station. Histogram can be represented for the data which can be represented as manner of intervals.The number of passengers boarding trains from to at a station can be represented in form of interval so this can be represented using histogram.
(c) The number of cassettes produced by  companies. Histogram can be represented for the data which can be represented as manner of intervals.The number of cassettes produced by  companies cannot be represented in form of interval so this cannot be represented using histogram.
(b) The height of competitors in an athletics meet. Histogram can be represented for the data which can be represented as manner of intervals.The height of competitors in an athletics meet can be represented in form of interval so this can be represented using histogram.
(a) The number of letters for different areas in a postman’s bag. Histogram can be represented for the data which can be represented as manner of intervals.The number of letters for different areas in a postman’s bag cannot be represented in form of interval so this cannot be represented using histogram.
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