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 probabilityof selecting a male?
– 1/40
– 1/10
– 10/30
– 10/40

A class consist of 10 males and 30 females. a random sampleof 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 distributionis located in the tail beyond z= 1.50?

Answer

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

…

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