Several psychology students are unprepared for a surprise true/false test with 1

Question

Several psychology students are unprepared for a surprise true/false test with 19 questions, and all of their answers are guesses. Find the mean and standard deviation for the number of correct answer for such students. Would it be unusual for a student to pass by guessing (which requires getting at least 15 correct answers)? Why or why not? mu = sigma = (Round to one decimal place as needed.) Choose the correct answer below. No, because 15 is within the range of usual values. Yes, because 15 is within the range of usual values. Yes, because 15 is greater than the maximum usual value. Yes, because 15 is below the minimum usual value.

Explanation / Answer

Mean:n*p=19*0.5=9.5

sd= sqrt npq=sqrt 19*0.5*0.5=2.18

Option D)

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