Hey guys, I need help with this question:

The correct answer is 1.000, but I'm having trouble figuring out how to do itSuppose the random variable x = 1, 2, 3, 4, 5, 6. In addition suppose:

p(1)=p(2) and p(3)=p(4)=p(5)=p(6)

If the mean μ=4.00, then P(μ - 2σ ≤ x ≤ μ + 2σ) is:

from the question, i can derive two formulas

(1) 2a + 4b = 1

(2) 3a + 18b = 4.00

Formula (2) was derived from the expected value rule

not sure how to continue on from here... any help?