Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
A quiz consists of 10 questions. Each question is marked either “right” or “wrong.” For each student in the class, the instructor keeps a record of the number of right answers the student got. In the class, the average number of right answers is 6.2 and the SD of the number of right answers is 1.4 find average of wrong answers
 one year ago
 one year ago
A quiz consists of 10 questions. Each question is marked either “right” or “wrong.” For each student in the class, the instructor keeps a record of the number of right answers the student got. In the class, the average number of right answers is 6.2 and the SD of the number of right answers is 1.4 find average of wrong answers
 one year ago
 one year ago

This Question is Open

DirectrixBest ResponseYou've already chosen the best response.0
@salman_09 Would you read the following and determine what you think about it? Thanks. Insight from @Phone_A_Friend_SS_from_California "I think the answer is 1.4. If x is the number right score than 10x would be the number wrong score. If M is the st. dev. of right scores then 10M is the mean of the wrong scores. (assuming here that any nonright response, including leaving answer space blank, is a wrong score. The sd. dev. formula for number right involves summing (xM)^2. The sd. dev. formula for number wrong scores involves summing [(10x)  (10M)]^2 = (x+M)^2 = (xM)^2."
 one year ago

DirectrixBest ResponseYou've already chosen the best response.0
http://openstudy.com/study#/updates/514015c6e4b0f08cbdc8ce5a Courtesy of @kropot72
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.