What is the probability that a random sample of 50 individuals shows an average annual income of at least $50,000? Select the parameters of the distribution to calculate the probability:

E(x), σx

Step-by-step explanation:

We have to x be their average annual income we need to find p ( x => 50000)

To find this probability we need  E(x), σx

For we find p ( x => 50000) we find the z value for 50000, ie the # of standart deviations that 50000 is away form   E(x)

z = (x  -  E(x)/σx)

now  p ( x => 50000) = p (z => (x  - E(x)/σx )

hence we can say that, to find p ( x => 50000) we need the parameters E(x), σx

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer

ou would have 12 of each