Provide and Appropriate Response
A quiz consists of 100 multiple choice questions, each with five possible answers, only one of which is correct. Find the mean and the standard deviation of the number of correct answers.

a. 
mean: 50; standard deviation: 4 

b. 
mean: 50; standard deviation: 7.07106781 

c. 
mean: 20; standard deviation: 4 

d. 
mean: 20; standard deviation: 4.47213595 
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