A quiz consists of 30 true or false questions. If the student guesses on each question,...

Question

Question

A quiz consists of 30 true or false questions. If the student guesses on each question, what is the mean number of correct answers?

A.) 0

B.) 15

C.) 6

D.) 30

Answer 1

✔ Recommended Answer

Answer #1

X ~ bin (n,p)

where, n = number of questions = 30

p = probability of getting correct answer = 1/2 [ as there are only two options,i.e, true and false ]

the mean number of correct answers be:-

$=np = (30*\frac{1}{2})= \mathbf{15}$

*** if you have any doubt regarding the problem ,please write it in the comment box...if satisfied,please UPVOTE.

Answer 2

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