ashlynm12
29.08.2019 •
Mathematics
What are the coordinates of the vertex of f(x)=2x^2+4x+9
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Ответ:
The coordinates of the vertex of a parabola are (h,k) where:
The coordinates of the vertex are (-1,7).
Ответ:
P(correct) = p = 1/3
P(wrong) = q = 1-p = 1-1/3 = 2/3
The general formula for binomial is;
Summation [nCk(p)^k(q)^(n-k)]
Where
n = 9
k = 7,8,9
Substituting;
P(7≤X≤9) = [9C7(1/3)^7(2/3)^2]+[9C8(1/3)^8(2/3)^1]+[9C9(1/3)^9(2/3)^0] = [16/2187]+[2/2187]+[1/19683]=163/19683 ≈ 0.00828
Therefore, the probability of getting atleast 7 question right is 0.00828.