Turner's syndrome is rare chromosomal disorder in which girls have only one X chromosome. The condition affects about 1 in 2000 girls in the United States. About 1 in 10 girls with Turner's syndrome suffers from the abnormal narrowing of aorta.
(a) In a group of 4000 girls, Compute the probability that no girls are affected with Turner's syndrome? That one girl is affected? Two? At least three?
(b) In a group of 170 girls affected with Turner's syndrome? Tat girl is affected? Two, At least three?"