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vodomira [7]
3 years ago
9

A bag contains tiles with the letters p -r-o-b-a-b-i-l-i-t-y Tyler chooses a tile without looking and doesn't replace it he choo

ses a second tile without looking what is the probability that he will choose the letter i both times
1/55
2/55
2/121
3/121
Mathematics
2 answers:
ipn [44]3 years ago
7 0

Answer:

\frac{1}{55}

Step-by-step explanation:

Total number of tiles: 11 (obtained from counting the letters in probability)

Probability of picking the letter "i" the first time:

There are 2 letter "i's", and 11 total options, so the probability of picking an "i" is:

\frac{2}{11}

Probability of picking the letter "i" the second time:

We now have one less letter in the bag, as the first letter "i" was not replaced.

This means we now only have 1 letter "i", and 10 total options, so the probability of picking the last "i" is:

\frac{1}{10}

When you have two probabilities that are dependant on each other, you multiply them to get the probability of one, given that the other has happened.

Total probability:

\frac{2}{11}*\frac{1}{10} = \frac{2}{110}

Simplify by dividing by 2:

\frac{1}{55}

butalik [34]3 years ago
6 0

Answer:

Multiply the fractions/probabilities

2 wanted tiles / 11 tiles in total x 1 wanted tile / 10 total tiles in total = 2/110 chance

2/110 = 1/55 chance

Hope this helps

Step-by-step explanation:

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The ratio of rock music to total CDs that ella owns is 25/40. Paolo has 50 rock music CDs. The ratio of rock music to total CDs
qaws [65]
They own a total of 120 CDs.

GIVEN:
Ella: ratio of rock music to total CDs that she owns 25/40
Paolo: has 50 rock music CDs. The ratio of rock music to total CD is equal to Ella's ratio.

Proportion: a/b = c/d where ad = bc

25/40 = 50/x
25x = 40 * 50
25x = 2000
25x / 25 = 2000 / 25
x = 80  total of Paolo's CDs

Total of Ella's CDs       =  40
Total of Paolo's CDs   =<u>  80</u>
Total CDs in all               120


5 0
3 years ago
6(x-2)= -18 find what x equals
KIM [24]

Answer:

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Step-by-step explanation:

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3 0
3 years ago
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balu736 [363]

Answer:

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sarah can complete a project in 90 minutes and her sister betty can complete it in 120 minutes if they both work on the project
alukav5142 [94]

Answer:

It will take them approximately 51.43 minutes to complete the project together

Step-by-step explanation:

This is what is called a "shared job" problem.

The best way to work on them is to start by finding the "portion" of the job done by each of the people in the unit of time.

So, for example, Sarah completes the project in 90 minutes, so in the unit of time (that is 1 minute) she completed 1/90 of the total project

Betty completes the project in 120 minutes, so in the unit of time (1 minute) she completes 1/120 of the total project.

We don't know how long it would take for them to complete the project when working together, so we call that time "x" (our unknown).

Now, when they work together completing the entire job in x minutes, in the unit of time they would have done 1/x of the total project.

In the unite of time, the fraction of the job done together (1/x) should equal the fraction of the job done by Sarah (1/90) plus the fraction of the job done by Betty. This in mathematical form becomes:

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So it will take them approximately 51.43 minutes to complete the project together.

8 0
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ANEK [815]
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