Rhea and Ned have switched from no method of contraception to a standard-days calendar method. Assuming perfect use, how likely are Rhea and Ned to avoid pregnancy with this method?

Name: Rhea and Ned have switched from no method of contraception to a standard-days calendar method. Assuming perfect use, how likely are Rhea and Ned to avoid pregnancy with this method?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The standard-days calendar method, when used perfectly, has a success rate of about 95% in preventing pregnancy.

Rhea and Ned Have Switched from No Method of Contraception