CUET Preparation Today
CUET
-- Mathematics - Section B1
Probability
A coin is biased so that the head is three times as likely to occur as tail. If the coin is tossed twice. The mean of the number of tails is :
$\frac{3}{4}$
$\frac{1}{3}$
$\frac{1}{4}$
$\frac{1}{2}$
