A true-false quiz has 36 questions. Assume that you completelyguess on every sin

Question

A true-false quiz has 36 questions. Assume that you completelyguess on every single question. The number of correct answersyou get most likely will be around 18 ,give or take _____ orso.
A dice with 6 sides is tossed 180 times. The number of 6s is likelyto be around 30,give or take _____ orso.
I got the answer for the 18 and 30 highlighted in red, but I needhelp learning how to find the "give or take" part. In my notes, itsays to use the Standard Deviation of the box multiplied by thesquare root of n. I don't know if that is right, though. PLEASEHELP!
A dice with 6 sides is tossed 180 times. The number of 6s is likelyto be around 30,give or take _____ orso.
I got the answer for the 18 and 30 highlighted in red, but I needhelp learning how to find the "give or take" part. In my notes, itsays to use the Standard Deviation of the box multiplied by thesquare root of n. I don't know if that is right, though. PLEASEHELP!

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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