A bag contains 30 white balls and 10 red balls. 16 balls are drawn one by one randomly from the bag with replacement. If X be the number of white balls drawn, the is equal to
a. 
4 
b. 

c. 
d. 
3 
A bag contains 30 white balls and 10 red balls. 16 balls are drawn one by one randomly from the bag with replacement. If X be the number of white balls drawn, the is equal to
a. 
4 
b. 

c. 
d. 
3 
P (probability of getting white ball) =
q = and n = 16
mean = np = 16. = 12 and
standard deviation = = =