A test consists of 910 true or false questions. If

Swebaceacichegh

Swebaceacichegh

Answered question

2022-01-29

A test consists of 910 true or false questions. If the student guesses on each question, what is the standard deviation of the number of correct answers?

Answer & Explanation

Lily Thornton

Lily Thornton

Beginner2022-01-30Added 19 answers

Explanation:
For binomial random variable, standard deviation is given by :
σ=np(1p)
=910(0.5)(10.5)=227.515.08310315.083

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