Answer :

(i) Total numbers of students obtaining less than 20 marks = 27+ 12

= 39


The cost of one work book = Rs 5


Therefore, cash of 39 workbooks = 39 × 5


= Rs.195


(ii) The number of students belonging to the highest mark group = 17


The cost of a prize = 10


Therefore, cost of 17 prize


= 10 × 17


= Rs170


(iii) The number of students belonging to the lowest mark group = 27


The number of problems solved by 15 students = 5


Therefore, the total number of problems solved by 27 students = 5 × 27


= 135


(iv) (a)The total number of students = 100


The number of students in range 40-49, = 17


% of students marks ranging 40-49 = × 100


= 17%


So, the given statement is true.


(b) The number of students in range 10-29 = 32


% of students marks ranging 10-29 = × 100


= 32%


So the given statement is false.


(v) No, of students getting less than 20 marks = 39


(vi) Total number of students getting more than 29 marks = 41


(vii) Number of students getting marks between 9 and 40 = 12 + 20 + 24


= 56


(viii) The number of students belonging to the highest mark group = 17


(ix) The number of students obtaining more than 19 marks = 100 - 27 - 12


= 61


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