Ask Remember Me?
 fornita2 Posts: 1, Reputation: 1 New Member #1 Mar 27, 2009, 07:19 AM
probability using random sampling
A kindergarten class consists of 14 boys and 11 girls. If the teacher selects children from the class using random sampling,

a. What is the probability that the first child selected will be a girl?
b. If the teacher selects a random sample of n=3 children and the first two children are both boys, what is the probability tha the third child selected will be a girl?
 BRycraft Posts: 111, Reputation: 2 Junior Member #2 Mar 27, 2009, 08:04 AM

The Probability for part a is 44% chance as there are 25 kids in the class and 11 are girls so 11/25=.44 or 44%
Part B= 47% almost 48% if you round up. If the 2 boys are set aside and not put back in the total group there are then a total of 23 kids in the class 11 of them still girls, 11/23= .478 nearly 48%

Not your question?

 Question Tools Search this Question Search this Question: Advanced Search

Check out some similar questions!

Random 10? [ 3 Answers ]

A building hoist lifts ten 50 kg bags of cement through a vertical distance of 30 m to the top of a high rise building. Calculate the work done by the hoist, assuming the acceleration due to gravity to be 9.81 m/s2. Work done = Force x Distance moved (J) but Force = Mass x Acceleration (N) ...

All right. So there's this guy I know, and hungout with a lot, but not recently. I really like him, and about a week ago some of his friends told me that he liked me too! I was so happy=]. But I haven't seen him for about a week, and a few days ago a friend of his said that the guy I like doesn't...