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Inheritance of blood types
Children inherit their blood type from their parents, with probabilities that re?ect the parents' genetic makeup. Children of Juan and Maria each have probability 1/4 of having blood type A and inherit independently of each other. Juan and Maria plan to have 4 children; let X be the number who have blood type A.
(a) What are n and p in the binomial distribution of X?
(b) Find the probability of each possible value of X, and draw a probability histogram for this distribution.
(c) Find the mean number of children with type A blood, and mark the location of the mean on your probability histogram.
Assume that an apptitude test are normally distributed. if the mean score in on 140 points and standard deviation is 25 points. find the cut off passing grade such that 67% of those taking the exams pass?
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According to the 1996 Statistical Abstract of the United States, 7.6% of the scores on the verbal portion of the Scholastic Aptitude Test (SAT) exceeded 600.
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