# Probability in a class and normal distributions

A class consist of 10 males and 30 females. If one student is randomly selected from the class what is the probability of selecting a male?

- 1/40

- 1/10

- 10/30

- 10/40

A class consist of 10 males and 30 females. a random sample of n=3 is selected. If the first two students are both females what is the probability that the third student is a male?

-10/37

-10/40

-10/38

-8/38

What proportion of a normal distribution is located in the tail beyond z= 1.50?

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#### Solution Preview

Answer

P (selecting a male) = Favorable no. of cases/Total no. of cases

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#### Solution Summary

The solution provides step by step method for the calculation of probabilities and normal distributions.

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