Mathematics, 13.12.2021 03:20 kyllow5644
The monthly utility bills in a city are normally distributed, with a mean of $100 and a standard deviation of $15. Find the probability that a randomly selected utility bill is (a) less than $70, (b) between $87 and $100, and (c) more
than $110.
(a) The probability that a randomly selected utility bill is less than $70 is
(Round to four decimal places as needed.)
(b) The probability that a randomly selected utility bill is between $87 and $100 is
(Round to four decimal places as needed.)
(c) The probability that a randomly selected utility bill is more than $110 is
(Round to four decimal places as needed.)
Answers: 2
Mathematics, 20.06.2019 18:04
Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?
Answers: 2
Mathematics, 21.06.2019 16:30
Solve by any method (graphing, substitution or linear combination)y = x - 82x + 3y = 1a) (2, -6)b) (5, -3)c) (4, -4)d) (0, -8)i figured it out. the answer is (5, -3)
Answers: 1
Mathematics, 21.06.2019 22:10
In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2
Answers: 2
The monthly utility bills in a city are normally distributed, with a mean of $100 and a standard dev...
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