SOLUTION: Dave gave a six question quiz to his Statistics students. The students were talented, and no one scored below a 4. Half the students scored 4, 40% scored 5, and 10% scored 6. Co

Question 1026509: Dave gave a six question quiz to his Statistics students. The students were talented, and no one scored below a 4. Half the students scored 4, 40% scored 5, and 10% scored 6. Compute the variance of this distribution (round answer to one decimal place).
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Let X = random variable for the score
PMF:
X=x 1 2 3 4 5 6
p(X=x) 0 0 0 0.50 0.40 0.10
==> E(X) = 1*0+2*0+3*0+4*0.50+ 5*0.40 +6*0.10 = 2+2+0.6 = 4.6, the mean of the distribution.
PMF of
1 4 9 16 25 36
p() 0 0 0 0.50 0.40 0.10
==> ,
==>

RELATED QUESTIONS
Dave gave a six question quiz to his Statistics students. The students were talented,... (answered by robertb)

The distribution of scores on a recent quiz in Mr. Waldron's statistics class is... (answered by Boreal)

Please answer this question for me. A random sample of 100 students who took a... (answered by stanbon)

Statistics Instruction: Apply the five steps of hypothesis-testing procedure to each... (answered by solver91311)

on an english quiz three students scored 5, five scored 4 and two students scored 2. find (answered by sofiyac)

On a quiz worth 5 points, four students earned a 5, seven students earned a 4, six... (answered by Fombitz)

The school has ten classes with the same amount of students in each class. One day the... (answered by ptaylor)

A random sample of 100 students who took a statistics exam were asked their score on the... (answered by stanbon)

Statistics 1. A researcher conducted an experiment to determine the effect of a... (answered by solver91311)