Question 1178702
<pre><font face = "consolas" color = "indigo" size = 3><b>
Hi
20 t or false questions guessed.  p(correct answer) =  1/2 
mean =  20(1/2) = 10
variance = 10(1-p) = 10(1/2) = 5
sd = √5 =    

Wish You the Best in your Studies.
</font></b></pre>