Question

A fair coin is tossed 99 times. If X is the number of times heads occur, then `P(X=r)` is maximum when `r` is `49 , 50` b. `50 , 51` c. `51 , 52` d. none of these
A. 49,50
B. 50,51
C. 51,52
D. none of these

Answer 1

Correct Answer - A
Here, `n=99, p=1//2`. Therefore ,`(n+1)p=50`
So, `P(X=r)` is maximum when `r=50or r=49`.