Thread: Simple Probabilities Plz Help

Hey,

Can someone plz answer the following questions and provide explanation.

1. P(E)=0.25 and 20 outcomes make up event E. Determine the number of outcomes?

2. There are 7 girls, 9 boys in a school camera club. The club needs to form a committee of 6 random people. Determine the outcome if:
a) The committee has no boys.
b) The committee has at least 1 girl.

3. You have a regular 6 side die. You roll it 2 times. Determine if:
a) Probability that you roll a sum of 7.
b) Probability that you roll a sum of 7 if the first roll is 5.

Any help would be greatly appreciated.

Thanx

1. I'm not 100% sure about this one.

2. so there are a total of 16 students and out of them you are interested in choosing six.

possible picks.

a)

b)

3. your sample would consist of

a) so out of those there are 6 possible ways to get a 7 and outcomes. so you have:



b)

Thanx for the help llll and mathstud.

shoudnt the answer for 3b) equal 1/6 not 1/216???

I really wish that if you do not understand the process that you would reframe from giving totally wrong information.
If “P(E)=0.25 and 20 outcomes make up event E” then clearly E happens in ¼ of the experiences, so there would have been 80 experiences.

Originally Posted by ballin_sensation

shoudnt the answer for 3b) equal 1/6 not 1/216???

you are correct it should be 1/6, I made a mistake punching it in my calculator.