SOLUTION: Several anthropology students are unprepared for a surprise true/false test with 30 questions, and all of their answers are guesses.
Find the mean for the number of correct answ
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Find the mean for the number of correct answ
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Question 1146752: Several anthropology students are unprepared for a surprise true/false test with 30 questions, and all of their answers are guesses.
Find the mean for the number of correct answers for such students.
Find the standard deviation for the number of correct answers for such students.
Give the range for the usual number of correct answers. Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! n is the number of students
p=.5 probability of guessing correctly
.5n is the mean
.5n*.5=variance or .25 n
sd is sqrt (V) and is .5*sqrt(n)
