• anonymous
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 what will be avg of wrong ans
  • Stacey Warren - Expert
Hey! We 've verified this expert answer for you, click below to unlock the details :)
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
  • jamiebookeater
I got my questions answered at in under 10 minutes. Go to now for free help!
  • Directrix
@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 10-x would be the number wrong score. If M is the st. dev. of right scores then 10-M is the mean of the wrong scores. (assuming here that any non-right response, including leaving answer space blank, is a wrong score. The sd. dev. formula for number right involves summing (x-M)^2. The sd. dev. formula for number wrong scores involves summing [(10-x) - (10-M)]^2 = (-x+M)^2 = (x-M)^2."
  • kropot72
Let the number of students = s Then the number of questions answered = 10s Let the number of right answers = r The average number of questions answered correctly per student = r/s The number of questions answered incorrectly = 10s - r The average number of wrong answers is\[\frac{10s-r}{s}=10-\frac{r}{s}=10-6.2=3.8\]
  • anonymous
"...the average number of right answers is 6.2 . . . what will be avg of wrong ans" That teacher must have been rather sleepy when s/he wrote that question. :-)

Looking for something else?

Not the answer you are looking for? Search for more explanations.