Mark the correct alternative in the following:
The probability of guessing correctly at least 8 out of 10 answers of a true false type examination is
Given:
n=10
p(true)=p(false)=1/2
p(x
8) = p(x=8) + p(x=9) + p(x=10)
= 10C8 p8 q2 + 10C9 p9 q1 + 10C10 p10 q0
= p10 (45+ 10+1)
1