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coldgirl [10]
3 years ago
8

How can you tell if something is a function or not a function

Mathematics
2 answers:
Snezhnost [94]3 years ago
7 0
<span>This characteristic of non-functions was noticed by I-don't-know-who, and was codified in "The Vertical Line Test": Given the graph of a relation, if you can draw a vertical line that crosses the graph in more than one place, then the relation is not a function.</span>
NeTakaya3 years ago
4 0
Also, if you can get all the coordinates----> (3,5)
3=x value
5=y value

If the x value ever appears more than once then it's not a function
Example (1,5) (2,6) (3,9) (2,4)
Is that a function?
No, because the x value, 2 appears twice.

Example: (4,5) (2,3) (1,5) (3,7)
Is that a function?
Yes, because non of the x values appear more than once, there for the vertical line test will nvr have 2 intersections

Hope this helps!
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c) 0.2251

d) Mean = 11.25, Standard deviation =  1.667  

Step-by-step explanation:

We are given the following information:

We treat trucks undergoing a brake inspection passin as a success.

P( trucks undergoing a brake inspection passes the test) = 75% = 0.75

a) Conditions for binomial probability distribution

  1. There are n independent trial.
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  3. The probability of success is same for all trials.

Then the number of trucks undergoing a brake inspection follows a binomial distribution, where

P(X=x) = \binom{n}{x}.p^x.(1-p)^{n-x}

where n is the total number of observations, x is the number of success, p is the probability of success.

Now, we are given n = 15

b) P(proportion of groups will between 8 and 10 trucks pass the inspection)

We have to evaluate:

P(8\leq x \leq 10) = P(x = 8) + P(x = 9) + P(x = 10)\\= \binom{15}{8}(0.75)^8(1-0.75)^7 + \binom{15}{9}(0.75)^9(1-0.75)^6 + \binom{15}{10}(0.75)^{10}(1-0.75)^5\\= 0.0393 + 0.0917 + 0.1651\\= 0.2961

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P(x = 3)\\= \binom{15}{3}(0.25)^3(1-0.25)^{12}\\=0.2251

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