A true-false quiz has 36 questions. Assume thatyou completely guess on every sin

Question

A true-false quiz has 36 questions. Assume thatyou completely guess on every single question. The number ofcorrect answers you get most likely will bearound 18 , give ortake _____ orso.
A dice with 6 sides istossed 180 times. The number of 6s is likely to bearound 30,give or take _____ or so.
I got the answer for the18 and 30 highlighted in red, but I need help learning how to findthe "give or take" part. In my notes, it says to use the StandardDeviation of the box multiplied by the square root of n. I don'tknow if that is right, though. PLEASE HELP!

A dice with 6 sides istossed 180 times. The number of 6s is likely to bearound 30,give or take _____ or so.
I got the answer for the18 and 30 highlighted in red, but I need help learning how to findthe "give or take" part. In my notes, it says to use the StandardDeviation of the box multiplied by the square root of n. I don'tknow if that is right, though. PLEASE HELP!

Explanation / Answer

Given information is Atrue-false quiz has 36 questions. Assume that you completely guesson every single question. n = 36 p = 0.5 standard deviation =np(1-p) = 36*0.5*0.5   = 3 Therfore give or take = 3n =336   = 18 2) n = 180     p = 1/6 =0.1667 standard deviation =np(1-p) = 180*0.1667*(1-0.1667)    = 5 Therfore give or take = 5n =5180   =  67.0874 standard deviation =np(1-p) = 180*0.1667*(1-0.1667)    = 5 Therfore give or take = 5n =5180   =  67.0874

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