(i) Total number of students obtaining less than 20 marks = 27 + 12 = 39.
The cost *** one – work book = Rs 5.
The cost of 30 work books = 39 x 5
= Rs 195.
(ii) The number of students belonging to the highest mark group = 17
The cost of a prize = 10.
The cost of 17 prizes = 10 x 17
= Rs 170
(iii) The number of students belonging to the lowest mark group = 27
The number of problems solved by 1 student = 5
The total number of problems solved by 27 students = 5 x 27 =135.
(iv) (a) Total number of students = 100
The number of students in range 40-49=17.
% of students obtaining marks ranging
40 - 49 = 17/100 x 100
= 17%
So, the given statement is true.
(b) The number of students in range 10 - 29 =12 = 120 = 32.
Percentage of students obtaining marks ranging 10 - 29 = 32/100 x 100 = 32%
So, the given statement is false (False).
(v) No. of students getting more than 20 marks = 39
(vi) Total no. of students getting more than 29 marks = 41
(vii) The 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