February 27, 2017

Homework Help: maths

Posted by Anonymous on Wednesday, June 3, 2009 at 6:40pm.

1. A die labelled A has one face marked 1, one face marked 2 and the other four faces marked 3. A die labelled B has four faces marked 2 and two faces marked 3. The dice A and B are thrown. Calculate the probability is 5.

I got 18/36

2. There are 12 boys and 20 girls in a class. 25% of boys and 25% of girls study physics; What is the probability that a student chosen at random is a girl studying physics.

I found that 3/12 boys therefore study physics and 5/20 girls therefore study physics. So 9/12 and 15/20 don't study. I'm not sure what to do next...add? multiply?

3. Calculate the probability that there are fewer boys than girls in a family of 6 children if the probability of have a boy is 1/2.


4. There are 6 nesting boxes in a garden. The probability of one nesting bow being occupied is 0.7%; Calculate the probability that at best 5 boxes are occupied.

Therefore 99.3% not occupied ...

Could someone please read through my work and help if possible. I know there are 4 questions its more advice/tips and is this right?
Thanks for any help! :-)

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