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
frozen [14]
2 years ago
12

The times a musician spends performing a rock song and a country song are approximately Normally distributed. The rock song has

a mean time of 133 seconds with a standard deviation of 3.5 seconds, and the country song has a mean time of 126 seconds with a standard deviation of 3.3 seconds. If the musician randomly selects 4 times the rock song is played and 3 times the country song is played, what is the probability that the mean time for the rock song is less than the mean time for the country song?
0.0034
0.0365
0.9964
0.9966
Mathematics
1 answer:
VikaD [51]2 years ago
8 0

Answer:

A. 0.0034

Step-by-step explanation:

You might be interested in
WILL REWARD Christina has already spent 2 minutes on the phone, and she expects to spend 2 more
Karolina [17]

Answer:

t=2x+ 2

Step-by-step explanation:

x is every phone call 2 is how many minutes she spends on each call The other 2 is the 2 minutes she already spended

5 0
3 years ago
Read 2 more answers
You have come in contact with the Zombie Virus and are now infected with one strand. The
coldgirl [10]

Answer:

y=2^x

Step-by-step explanation:

5 0
3 years ago
Smith and his friends are gaming online on a popular website. An hour later, 6 friends go
Firlakuza [10]

Answer:

12

Step-by-step explanation:

4 0
3 years ago
A paint company mixes it's paint with water to create more paint per gallon. They currently have ten gallon jugs which contain 1
Karo-lina-s [1.5K]
<h3>Answer:  1.25 gallons</h3>

==================================

Explanation:

They currently have ten gallon jugs that contain 10% water, so this means 0.10*10 = 1 gallon of the jug is water and the other 10-1 = 9 gallons is paint. This is assuming the cans are just paint and water.

The ratio of paint to water is 90:10 which reduces to 9:1

Often it helps to reduce as much as possible, but it's actually more handy in this case to keep it at 90:10 so you can see the two parts add back up to 100%

--------------

Let x be the amount of water we add. This amount is in gallons.

We start off with 1 gallon of water and it bumps up to 1+x gallons of water.

The overall amount of 10 gallons also bumps up to 10+x gallons.

We want a ratio of 80:20 this time, so we want 20 parts water and 80 parts paint. In other words, we want 20/(20+80) = 20/100 = 20% water

Divide (1+x) over (10+x) to get (1+x)/(10+x). This represents the fraction of water. We want this fraction to be equal to 0.20, which is the 20% water amount. It is also equal to 20/100.

--------------

(1+x)/(10+x) = 20/100

100(1+x) = 20(10+x) ... cross multiply

100+100x = 200+20x ... distribute

100x-20x = 200-100

80x = 100

x = 100/80 ... divide both sides by 80

x = 1.25

You need to add 1.25 gallons of water

--------------

If you add 1.25 gallons of water, then,

amount of water = 1+x = 1+1.25 = 2.25

amount of paint&water = 10+x = 10+1.25 = 11.25

So you'll have 2.25 gallons of water out of 11.25 gallons of water&paint mix

2.25/11.25 = 0.2 = 20% water

This confirms our answer.

--------------

Extra info:

1.25 gallons = 1 gallon + 1/4 gallon

1.25 gallons = 1 gallon + 1 quart

This is because 1 gallon = 4 quarts, so 1 quart = 1/4 gallon.

5 0
3 years ago
Suppose f(x)=x^2-2 find the graph of f(1/2x)
Scorpion4ik [409]

Answer:

graph g(x)=1/4 x^2 - 2

Step-by-step explanation:

You are to replace x with (1/2x) in the expression x^2-2

So you have (1/2x)^2-2

1/4 x^2-2

Graph some points for g(x)=1/4 x^2-2

The vertex is (0,-2) and the parabola is open up.

I would graph 2 more points besides the vertex

x   |  g(x)                     ordered pairs to graph

-----------                         (-1,-1.75) and (0,-2) and (1,-1.75)

-1        -1.75

0         -2

1         -1.75

3 0
3 years ago
Read 2 more answers
Other questions:
  • Combining like terms <br><br> simplify the expression <br> -6k + 7k
    6·2 answers
  • Add (7x^2-2x) + (4x-3)
    6·1 answer
  • 3.25 + 3 tenths A.6.25 B.3.55
    13·2 answers
  • Step by step <br>7.86×4.6
    6·1 answer
  • Someone please help me
    14·1 answer
  • Find the volume of the following rectangular prism HELP PLSSSSSSSS
    5·1 answer
  • Whose the best spiderman?<br><br> A. Tobey <br><br> B. Tobey<br><br> Or <br><br> C. Tobey?
    8·2 answers
  • Select all explanation that prove triangle ABC is congruent to triangle A'B'C
    13·1 answer
  • In order to select new board members, the French club held an election. 20% of the 40 members of the club voted. How many member
    5·1 answer
  • G.MG.3 Beth is going to enclose a rectangular area in back of her house. The house wall will form one of the four sides of the f
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!