Change the following active sentences to passive sentences: 1) we carried out a thorough study of internet sources.
2)we distributed 100 questionnaires to customers.
3)we analysed the data
4)we calculated the frequencies of all the questionnaire responses.
5)we converted the frequencies to percentages.

1)    A thorough study of internet sources was conducted.

2)   100 questionnaires were distributed to customers.

3)   The data were analyzed.

4)   The frequencies of all the questionnaire responses were calculated.

5)   The frequencies were converted to percentages.

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Explanation:

if this a question please specify what is there to exactly answer.