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1. the probability that a person in the united state has a type O+ blood is...

1. the probability that a person in the united state has a type O+ blood is 38% . twenty unrelated are selected at random . find the probability that atleast one of the twenty has type o+ blood ?

2. given that the population is approximately normally distrubuted with mean = 45 and a standard deviation of = 6 find the vaule of the 30th precentile of the datat vaule

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