The bar representing which of the following probabilities on a histogram would be the highest? A.1/30 B.1/15 C.1/10 D.2/15
help asap !! please

- anonymous

- jamiebookeater

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- jim_thompson5910

convert each fraction to a decimal number and that will allow you to compare the numbers easier

- jim_thompson5910

for example
1/30 = 0.0333333...
1/15 = 0.0666667
So we can see that 1/15 is larger than 1/30 since 0.0666667 is larger than 0.033333

- anonymous

so it would be b?

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## More answers

- jim_thompson5910

if you just had those two fractions, yes
but you need to compare the rest of the fractions

- anonymous

c is 0.1 and d is 0.13 so than it would be d than?

- jim_thompson5910

correct

- anonymous

oh okay thank you,

- jim_thompson5910

you're welcome

- anonymous

Do you know anything about this?

##### 1 Attachment

- jim_thompson5910

that's the combination of choosing 7 things out of 9
basically it's asking "how many ways are there to choose 7 items out of 9 where order does not matter"

- anonymous

I don't understand, cause the choices are A.66 B.55 C.36 D.45

- jim_thompson5910

have you learned about permutations?

- anonymous

no , this is online math,

- jim_thompson5910

I figured that, but I would have also figured that you have learned about permutations or combinations by now

- jim_thompson5910

seems odd how they skipped over that

- anonymous

No, it was never on any of the information given to me for each section,

- jim_thompson5910

well luckily we can take advantage of the fact that 9 C 7 = 9 C 2
9 C 2 = (9*8)/2 = ???

- anonymous

36

- jim_thompson5910

so 9 C 7 = 36 as well

- jim_thompson5910

you can also use Pascals triangle to get the same thing

- anonymous

what about this? If a probability distribution is 5/12,1/6 ,1/4 , x, what is the value of x? A.1/3 B.1/6 C.1/12 D.1/4

- jim_thompson5910

add up all the fractions including x and set it equal to 1
then solve for x

- jim_thompson5910

5/12 + 1/6 + 1/4 + x = 1
solve this for x

- anonymous

i don't know, 7/22?

- jim_thompson5910

no

- jim_thompson5910

oh wait, one sec

- anonymous

i don't undersad

- anonymous

understand*

- jim_thompson5910

what do you get when you combine these fractions
5/12 + 1/6 + 1/4

- anonymous

i don't know , cause they have different numbers do i need them both to get 12?

- jim_thompson5910

yes you need all the denominators to be equal to 12

- anonymous

12/12?

- anonymous

you multiply 6 with 2 and 4 with 3 ,

- jim_thompson5910

5/12 = 5/12
1/6 = 2/12
1/4 = 3/12
-----------------
5/12 + 1/6 + 1/4
is the same as
5/12 + 2/12 + 3/12

- anonymous

10/12 reduced to 5/6?

- jim_thompson5910

good

- anonymous

thaat not right

- jim_thompson5910

we're not done yet

- anonymous

oh

- jim_thompson5910

but we're on the right path to getting there

- anonymous

okay whats next?

- jim_thompson5910

5/12 + 1/6 + 1/4 + x = 1
is the same as
5/6 + x = 1
Now subtract 5/6 from both sides to isolate x
5/6 + x - 5/6 = 1 - 5/6
x = 1 - 5/6
x = ???

- anonymous

4/6 reduced to 2/3? but that not on there either?

- anonymous

nevermind 0.16666666666

- jim_thompson5910

no not this
|dw:1359342264313:dw|
but this
|dw:1359342279294:dw|

- anonymous

so it be 1/5?

- anonymous

1/6*

- jim_thompson5910

1/6 yep

- anonymous

Is it okay if i just message you and you help me please?

- jim_thompson5910

sure, but I don't want to do every problem for you
just letting you know

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