Answer :

Given:


Number of students = 200


Formula Used\Theory:


Multiplying of ratio of each part and total value gives out


Value of each part


(a) The number of students influenced by radio is =


Ratio × total number of students


= × 200


= 9 × 10


= 90students


(b) Number of students influence more by radio than music video channel


= difference of ratio × number of students


= () × 200


= () × 200


=


= 37 × 2


= 74 students


(c) Number of students influence by friends and relatives


= Ratio × total number of students


= × 200


= 3 × 10


= 30


Number of students heard CD in a shop = Ratio × total number of students


= × 200


= 20 students


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