A) \[\frac{1}{32}\]
B) \[\frac{3}{16}\]
C) \[\frac{13}{16}\]
D) \[\frac{5}{8}\]
Correct Answer: C
Solution :
P (at least 2 heads) = 1 - P (less than two heads) = 1 - [P (no head) + P (one head)] \[=-1\left[ {{\left( \frac{1}{2} \right)}^{5}}+{{\left( \frac{1}{2} \right)}^{5}} \right]\] \[=1-(6){{\left( \frac{1}{2} \right)}^{5}}=\frac{13}{16}\]
You need to login to perform this action.
You will be redirected in
3 sec
