30% of the seals in a colony have a certain genetic trait. If you sample 50 of them, what is the chance the sample will contain 20 or more seals with

30% of the seals in a colony have a certain genetic trait. If you sample 50 of them, what is the chance the sample will contain 20 or more seals with this trait? Test scores of a large population of students on a standard test have mean = 500 and a standard deviation = 100. (A) For a random sample of 50 students from the population, what is the chance their mean score exceeds 520? (B) If a single student is selected at random from the population, what is the chance their score exceeds 520?

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