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 Post subject: the tutors maths cd 2
PostPosted: Sun Jul 26, 2009 8:23 pm 
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Joined: Sat Mar 15, 2008 3:08 pm
Posts: 121
Hi guys,
My ds has just started on this and need help with similar question types:
Test 1
Questions 34 & 41
Test 2
Questions 34 & 31

Please help........
Thanks,
Toy


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 Post subject:
PostPosted: Sun Jul 26, 2009 8:30 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
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If you write out the questions I can help.


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 Post subject:
PostPosted: Sun Jul 26, 2009 11:37 pm 
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Joined: Sat Mar 15, 2008 3:08 pm
Posts: 121
TEST 1, Q 34
There are 3 bus companies who run services in Chester. One company has 5 blue buses, one has 6 green buses and one has 4 red buses. If one bus from each company were to park at the bus station at the same time, how many possible combinations of buses are there?
Ans: 5x6x4

Q 41,
Can't type as it has a diagram.

TEST 2, Q 34
The local nursery had some fruit trees that had no labels on them. There were 3 apple trees, 5 pear trees and 4 plum trees. The customers could choose any tree at random. Which of the following have 2 true statements
Ans:
There was a less than even chance of choosing a pear tree. There was a less than even chance of choosing an apple tree.

No idea what less than even chance or more than even chance means!!!!

Q31
Also, involves a diagram so can't write the question.

Many thanks for the help
Toy


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 Post subject:
PostPosted: Mon Jul 27, 2009 9:14 am 
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Joined: Mon Feb 12, 2007 1:21 pm
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Quote:
TEST 1, Q 34
There are 3 bus companies who run services in Chester. One company has 5 blue buses, one has 6 green buses and one has 4 red buses. If one bus from each company were to park at the bus station at the same time, how many possible combinations of buses are there?


OK - start with an easier question .. when I spin two coins they can land:

HH HT TH TT 4 ways ie 2 x 2

Try again - 3 red counters, 2 blue ones:

R1B1 R1B2 R2B1 R2B2 R3B1 R3B2 ie 3 x 2 = 6

If you extend this perhaps you can see why you multiply the number of buses together?



Quote:
TEST 2, Q 34
The local nursery had some fruit trees that had no labels on them. There were 3 apple trees, 5 pear trees and 4 plum trees. The customers could choose any tree at random. Which of the following have 2 true statements



An even chance means the probablity is more than 1/2 or 0.5

Prob (apple tree) = 3/12 < half

Prob (pear tree) = 5/12 < half

Prob (plum tree) = 4/12 < half


Since I don't know what the other statements are I hope this helps!


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 Post subject:
PostPosted: Mon Jul 27, 2009 11:34 am 
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Joined: Sat Mar 15, 2008 3:08 pm
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thanks Guest 55


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