The probability that a person will remember between 100a% and 100 b% of material learned in an experiment is p a , b = ∫ a b 15 4 x 1 − x d x where x represents the proportion remembered. (See figure.) (a) For a randomly chosen individual, what is the probability that he or she will recall between 50% and 75% of the material? (b) What is the median percent recall? That is, for what value of b is it true that the probability of recalling 0 to b is 0.5?
The probability that a person will remember between 100a% and 100 b% of material learned in an experiment is p a , b = ∫ a b 15 4 x 1 − x d x where x represents the proportion remembered. (See figure.) (a) For a randomly chosen individual, what is the probability that he or she will recall between 50% and 75% of the material? (b) What is the median percent recall? That is, for what value of b is it true that the probability of recalling 0 to b is 0.5?
The probability that a person will remember between 100a% and 100b% of material learned in an experiment is
p
a
,
b
=
∫
a
b
15
4
x
1
−
x
d
x
where x represents the proportion remembered. (See figure.)
(a) For a randomly chosen individual, what is the probability that he or she will recall between 50% and 75% of the material?
(b) What is the median percent recall? That is, for what value of b is it true that the probability of recalling 0 to b is 0.5?
1. Show that the vector field
F(x, y, z)
=
(2x sin ye³)ix² cos yj + (3xe³ +5)k
satisfies the necessary conditions for a conservative vector field, and find a potential function for
F.
1. Newton's Law of Gravitation (an example of an inverse square law) states that the magnitude
of the gravitational force between two objects with masses m and M is
|F|
mMG
|r|2
where r is the distance between the objects, and G is the gravitational constant. Assume that the
object with mass M is located at the origin in R³. Then, the gravitational force field acting on
the object at the point r = (x, y, z) is given by
F(x, y, z) =
mMG
r3
r.
mMG
mMG
Show that the scalar vector field f(x, y, z) =
=
is a potential function for
r
√√x² + y² .
Fi.e. show that F = Vf.
Remark: f is the negative of the physical potential energy, because F = -V(-ƒ).
2. Suppose f(x) = 3x² - 5x. Show all your work for the problems below.
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