Q21Single correct2 Marks7 Aug 2022

A fair coin is tossed three times. If X denote the number of heads followed immediately by a tail, then what is the expected value of X?

A

$\frac{7}{8}$

B

$\frac{3}{8}$

C

$\frac{4}{8}$

D

$\frac{5}{8}$