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

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)

RELATED QUESTIONS
Several students are unpreapred for a surprise true/false test with 9 questions and all... (answered by stanbon)

Several students are unprepared for a true/false test with 50 questions, and all of their (answered by stanbon)

Several students are unprepared for multiple choice quiz with 10 questions and all their... (answered by jim_thompson5910)

. Several students are unprepared for a multiple-choice quiz with 20 questions, and all... (answered by ewatrrr)

how many arrangements of answers are possible for a true/false test with 10... (answered by scott8148)

How many arrangements of answers are possible for a true/false test with 10... (answered by MathLover1)

There are 10 true/false questions on a test and 5 multiple choice questions with four... (answered by arallie)

A test include the following components 8 true- false questions; five multiple-choice... (answered by stanbon)

In a test of 30 questions with True, False answers, Find the standard deviation Round (answered by ewatrrr)