Nuclear physicist found the probability of neutral particles being reflected was 0.16 and of being absorbed...

Nuclear physicist found the probability of neutral particles being reflected was 0.16 and of being absorbed as 0.84.

a. What is the expected number of particles that would be reflected if 1,000 are released?

b. Assuming the normal approximations to the binomial distribution, what is the probability that 140 or fewer particles would be absorbed?