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
4.(02.05 MC)
MA_775_DIABLO [31]

Answer:

yes two figures are congruent

6 0
3 years ago
A study found that, in 2005, 12.5% of U.S. workers belonged to unions (The Wall Street Journal, January 21, 2006). Suppose a sam
Julli [10]

Answer:

There is not enough evidence to support the claim that union membership increased.  

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 400

p = 12.5% = 0.125

Alpha, α = 0.05

Number of women belonging to union , x = 52

First, we design the null and the alternate hypothesis  

H_{0}: p = 0.125\\H_A: p > 0.125

The null hypothesis sates that 12.5% of U.S. workers belong to union and the alternate hypothesis states that there is a increase in union membership.

This is a one-tailed(right) test.  

Formula:

\hat{p} = \dfrac{x}{n} = \dfrac{52}{400} = 0.13

z = \dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}

Putting the values, we get,

z = \displaystyle\frac{0.13-0.125}{\sqrt{\frac{0.125(1-0.125)}{400}}} = 0.3023

Now, we calculate the p-value from the table.

P-value = 0.3812

Since the p-value is greater than the significance level, we fail to reject the null hypothesis and accept the null hypothesis.

Conclusion:

Thus, there is not enough evidence to support the claim that union membership increased.

8 0
2 years ago
Which phrase describes the variable expression z+ 8?
a_sh-v [17]

9514 1404 393

Answer:

  A. z increased by 8

Step-by-step explanation:

When a positive value is added, the original value (z) is <em>increased</em>.

  z + 8   ⇔   z increased by 8

5 0
2 years ago
Solve for x: 12-2x=-2(y-x)
a_sh-v [17]
12 - 2x = -2(y - x)

12 - 2x = -2y - (-2x)

12 - 2x = -2y + 2x

12 - 2x - 2x = -2y + 2x - 2x

12 - 4x = -2y

12 - 12 - 4x = -2y - 12

-4x = -2y - 12

-4x/4 = -2y/4 - 12/4

-x = -0.5y - 3

-x/-1 = -0.5y/-1 - 3/-1

x = 0.5y + 3

or

x = 3 + 0.5y
3 0
2 years ago
1. A kitchen is shaped like a rectangle with dimensions of 4 ft by 7 ft. The
coldgirl [10]

Answer:

112 tiles

Step-by-step explanation:

8 0
3 years ago
Other questions:
  • Jason places a mirror on the ground 40 feet from the base of a tree. He walks backwards until he can see the top of the tree in
    7·2 answers
  • What is number 5???!!
    10·1 answer
  • Lance wants to find the total length of 3 boards.He uses the expression 3 1/2+( 2+4 1/2 how can lance rewrite the expression usi
    9·2 answers
  • What is the best estimate for 48% of 199
    9·2 answers
  • If y-18=14, what is the value of 2(y+9)?
    13·2 answers
  • Garrett had 120 comics in his comic book collection. 45 of them are Spiderman comics, 50 of them are Batman comics and the rest
    7·1 answer
  • A cross section of a rectangular pyramid is made perpendicular to the base and through the vertex as shown. What is the area of
    14·2 answers
  • HELP PLS i don’t understand it so can someone please help me
    8·1 answer
  • Robert is going on a 2-day canoeing trip with his outdoor adventure group. Robert paddled at a constant sped and travels 3/4 of
    14·1 answer
  • 7. a) Find the value of x. (3 pts)
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!