1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
klemol [59]
3 years ago
12

can someone please help me with this math thing, i'm being timed and i don't know what else i can do, if someone wants to help j

ust do the Nick one the graph and the Sammy and Mariam one i’ll try to do by myself but please help me

Mathematics
1 answer:
Neporo4naja [7]3 years ago
6 0

Answer:

Step-by-step explanation:

a. amt. of weeks and hours worked

You might be interested in
Let X denote the amount of time a book on two-hour reserve is actually checked out, and suppose the cdf is the following. F(x) =
Troyanec [42]

Answer:

a) P (x <= 3 ) = 0.36

b) P ( 2.5 <= x <= 3  ) = 0.11

c) P (x > 3.5 ) = 1 - 0.49 = 0.51

d) x = 3.5355

e) f(x) = x / 12.5

f) E(X) = 3.3333

g) Var (X) = 13.8891  , s.d (X) = 3.7268

h) E[h(X)] = 2500

Step-by-step explanation:

Given:

The cdf is as follows:

                           F(x) = 0                  x < 0

                           F(x) = (x^2 / 25)     0 < x < 5

                           F(x) = 1                   x > 5

Find:

(a) Calculate P(X ≤ 3).

(b) Calculate P(2.5 ≤ X ≤ 3).

(c) Calculate P(X > 3.5).

(d) What is the median checkout duration ? [solve 0.5 = F()].

(e) Obtain the density function f(x). f(x) = F '(x) =

(f) Calculate E(X).

(g) Calculate V(X) and σx. V(X) = σx =

(h) If the borrower is charged an amount h(X) = X2 when checkout duration is X, compute the expected charge E[h(X)].

Solution:

a) Evaluate the cdf given with the limits 0 < x < 3.

So, P (x <= 3 ) = (x^2 / 25) | 0 to 3

     P (x <= 3 ) = (3^2 / 25)  - 0

     P (x <= 3 ) = 0.36

b) Evaluate the cdf given with the limits 2.5 < x < 3.

So, P ( 2.5 <= x <= 3 ) = (x^2 / 25) | 2.5 to 3

     P ( 2.5 <= x <= 3  ) = (3^2 / 25)  - (2.5^2 / 25)

     P ( 2.5 <= x <= 3  ) = 0.36 - 0.25 = 0.11

c) Evaluate the cdf given with the limits x > 3.5

So, P (x > 3.5 ) = 1 - P (x <= 3.5 )

     P (x > 3.5 ) = 1 - (3.5^2 / 25)  - 0

     P (x > 3.5 ) = 1 - 0.49 = 0.51

d) The median checkout for the duration that is 50% of the probability:

So, P( x < a ) = 0.5

      (x^2 / 25) = 0.5

       x^2 = 12.5

      x = 3.5355

e) The probability density function can be evaluated by taking the derivative of the cdf as follows:

       pdf f(x) = d(F(x)) / dx = x / 12.5

f) The expected value of X can be evaluated by the following formula from limits - ∞ to +∞:

         E(X) = integral ( x . f(x)).dx          limits: - ∞ to +∞

         E(X) = integral ( x^2 / 12.5)    

         E(X) = x^3 / 37.5                    limits: 0 to 5

         E(X) = 5^3 / 37.5 = 3.3333

g) The variance of X can be evaluated by the following formula from limits - ∞ to +∞:

         Var(X) = integral ( x^2 . f(x)).dx - (E(X))^2          limits: - ∞ to +∞

         Var(X) = integral ( x^3 / 12.5).dx - (E(X))^2    

         Var(X) = x^4 / 50 | - (3.3333)^2                         limits: 0 to 5

         Var(X) = 5^4 / 50 - (3.3333)^2 = 13.8891

         s.d(X) = sqrt (Var(X)) = sqrt (13.8891) = 3.7268

h) Find the expected charge E[h(X)] , where h(X) is given by:

          h(x) = (f(x))^2 = x^2 / 156.25

  The expected value of h(X) can be evaluated by the following formula from limits - ∞ to +∞:

         E(h(X))) = integral ( x . h(x) ).dx          limits: - ∞ to +∞

         E(h(X))) = integral ( x^3 / 156.25)    

         E(h(X))) = x^4 / 156.25                       limits: 0 to 25

         E(h(X))) = 25^4 / 156.25 = 2500

8 0
2 years ago
Please help me as soon as possible
elixir [45]
You might want to see what other people say but I think that it is 40
5 0
3 years ago
Read 2 more answers
Hugo plays basketball.
djyliett [7]

Answer:

170

Step-by-step explanation:

multiply 12×15=170

4 0
3 years ago
What is log base 5(4*7 )+log base 5 of 2 written as a single log?
nataly862011 [7]
The answer for the exercise shown above is the last option (Option D), which is:

 D. log base 5 of 56

The explanation is show below:

 1. You have the following logarithm expresssion:

 <span>log5(4*7 )+log5(2)
</span>
 2. By the logarithms properties, you can rewrite the logarithm expression as following:

 log5(28)(2)
 log5(56)

 3. Therefore, as you can see, the answer is the option mention before.
 
7 0
3 years ago
Read 2 more answers
Find C and a so that f(x) = CaX models the situation described. State what the variable x represents in your formula. In 2000 a
Nezavi [6.7K]

Answer:

f(x) = Ca^x

x = years since 2000.

f(0) = 220000 = Ca^0 = C

f(x) = 220000a^x

f(1) = 220000(1-0.11) = 220000a^1

a = 0.89

f(x) = 220000(0.89)^x

So each year reduces by 89%

8 0
2 years ago
Other questions:
  • In a small town, electricity prices have been rising 2% each year since 2008. Which
    8·1 answer
  • The function f(x) varies inversely with x and f(x) =6 when x =4 what time s f(x) when x = 8
    6·1 answer
  • Suppose you are driving to visit a friend in another state. you are driving 55 miles per hour. you must drive 440 miles total. i
    7·1 answer
  • SOMEONE PLEASE HELP TO BE MARKED THE BRAINLIEST
    8·1 answer
  • there are 80 student in a class if 6 of them are absent then find the percentage of the present student​
    7·2 answers
  • find the equation of a circle which passes through the point (2,-2) and (3,4) and whose centre lies on the line x+y=2
    10·1 answer
  • Each side of a square courtyard is 16 meters long. It costs $14.00 per meter to replace the brick wall around the courtyard. How
    12·1 answer
  • PLEASE HELP I WILL GIVE 50 POINTS!!!!!!
    10·1 answer
  • Solve the system of equations using any method. Show and explain all work.
    5·1 answer
  • By using a problem-solution structure, the author is able to show readers how people are hurting the planet. The structure also
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!