Correct answer only !

a coin is flipped four times. x is the number of times it will land with a head up.

which statement is true about this situation?

Step-by-step explanation:

I THINK it’s the first but that’s only a guess

 a) The variable X has a binomial distribution.                                      .                     P(Success) = 0.5, n = 4

Step-by-step explanation:

A binomial experiment must meet the following criteria:

Since all of these are satisfied, the variable X has a binomial distribution.

In the given experiment:

The probability of success is 1 heads out of 2 possible outcomes = 50% --> 0.5

The number of trials (flips) is 4.

So, the answer is a.

b. the decimal could be two-tenths.

step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: