Which graph shows a proportional relationship between x and y

Mathematics

2 answers:

cestrela7 [59]2 years ago

7 0

The 2nd one! i believe that is correct!

Galina-37 [17]2 years ago

3 0

I'm pretty sure it's the first one. For something to be directly proportional it has to go through the origin (0,0) of the graph. Y/X is the formula for directly proportional relationships if that helps.

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Sonbull [250]

Using the binomial distribution, it is found that there is a 0.0231 = 2.31% probability that the first person to say yes will occur with the seventh customer.

For each person, there are only two possible outcomes, either they say yes, or they say no. The probability of a person saying yes is independent of any other person, which means that the binomial distribution is used to solve this question.

Binomial probability distribution

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$C_{n,x} = \frac{n!}{x!(n-x)!}$

The parameters are:

x is the number of successes.
n is the number of trials.
p is the probability of a success on a single trial.

In this problem:

The probability that the seventh person is the first to say yes is P(X = 0) when n = 6(first six say no) multiplied by 0.37(probability the seventh say yes).
37% say yes, hence $p = 0.37$