Opinion polls determine that 20% of Americans adults claim that they don't get enough sleep. Assume you take a random sample of 200 American adults and count the number X in your sample that claim that they never have time to relax.
The probability that X is at least 50 is
A. less than 0.0001.
B. about 0.962.
C. about 0.200.
D. about 0.038.
Please explain why