When finding if a set is a function, the best method is looking at the x coordinates. Make sure that the if the x coordinates repeats that the y coordinates are identical, meaning if a point repeats; (2,0) and (2,0). If the x coordinates repeats itself but has two different y coordinates, it is not a function: (2,0) and (2,6).
A. x=0 repeats with two different y coordinates, NOT FUNCTION
B. No x's repeat, FUNCTION
C. x=2 repeats with two different y coordinates, NOT FUNCTION
D. x=6 repeats with two different y coordinates, NOT FUNCTION

5 0

3 years ago

2017 poll found that 56% of college students were very confident that their major will lead to a good job. If 20 college studen

Furkat [3]

Answer: 0.1318

Step-by-step explanation:

Given : The proportion of college students were very confident that their major will lead to a good job : p= 0.56

Let x be the binomial variable (for success) that represents the number of college students were very confident that their major will lead to a good job.

with parameter p = 0.56 n= 20

Using binomial , we have

$P(x)=^nC_xp^x(1-p)^{n-x}$

Required probability :-

$P(x=13)=^{20}C_{13}(0.56)^{13}(1-0.56)^{20-13}\\\\=\dfrac{20!}{13!7!}(0.56)^{13}(0.44)^{7}\\\\=0.131833824312\approx0.1318$

Hence, the probability that 13 of them were very confident their major would lead to a good job =0.1318

8 0

3 years ago