#1 In Anne's community college, 48.9% of students are Asian and 2.5% are Asian chemistry majors. What percentage of Asian students are chemistry majors?

#2 a sample of 4 different calculators is randomly selected from a group of containing 49 that are defective and 26 that have no defects. What is the probability that al four of the calculators selected are defective?

a)0.1822 b)0.0793 c)14.1723 d) 0.1743

#3 a bag contains 9 red chips and 12 blue chips. Two chips are selected randomly without replacement from the bad. What is the probability that the two chips are the same color?

a).486 b) .171 c) .536 d).514

#4 a sample of 4 different calculations is randomly selected from a group containing 20 that are defective and 31 that have no defects. What is the probability that at least one of the calculators is defective?

a).863 b).874 c).200 d).126



any help would be great thanks

 

Geez, you want us to do your homework for you?

 

1)5.11%

 

2)d = .1743

*This assumes the calculators aren't replaced in the sample if they are then its a=.182

 

I'm with Raptor no more till you demonstrate that you've made a fair attempt

 

hmmm... I got 1.55%...

 

yep thats what i got

 

on this question you use the general multi rule...
P(a and b) = P(a) * P(b|a)

 

Use the figure of 100 to check it.

2.5 people in the class of 100 are asian chem majors.

2.5 chem students as a percentage of the 48.9 total asians = 2.5/48.9 = .0511 or 5.11%

 

just curious...what level math is this?