Is this a reasonable inference? Why or why not?

This research group did a study asking 2,000 patents to submit responses to a questionnaire by mail. They received 450 responses. They found that the

This research group did a study asking 2,000 patents to submit responses to a questionnaire by mail. They received 450 responses. They found that the mean survival rate for respondents was 10 years after
diagnosis.The researchers concludes that with this diagnosis the average survival rate is 10 years.

or:This research group did a study asking 2,000 patents to submit responses to a questionnaire by mail. They received 450 responses. They found that the mean survival rate for respondents was 10 years afterdiagnosis.The researchers concludes that with this diagnosis the average survival rate is 10 years.

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