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
algol13
3 years ago
14

A study of the amount of time it takes a mechanic to rebuild the transmission for a 2005 Chevrolet Cavalier shows that the mean

is 8.4 hours and the standard deviation is 1.8 hours. If 40 mechanics are randomly selected, find the probability that their mean rebuild time exceeds 8.7 hours.
0.1346

0.1285

0.1946

0.1469
Mathematics
1 answer:
iogann1982 [59]3 years ago
3 0

Answer:

0.1469

Step-by-step explanation:

Given from the question;

Mean=8.4 hrs=μ

Standard deviation=1.8 hrs=δ

Sample size, n=40

Let  x=8.7

z=(x-μ)÷(δ÷√n)  

Find z(8.7)

z=(8.7-8.4)÷(1.8÷√40)

z={0.3×√40}÷1.8=1.05409

z=1.0541

Read from the  standard normal probabilities table

P(z>1.0541)

=0.1459

You might be interested in
The table below represents an exponential function what is the common ratio
Greeley [361]

Solution:

Given:

A table representing an exponential function.

The x-values represent the terms, while the y-values represent the numbers.

The common ratio is gotten from the numbers (y-values).

The formula for common ratio is given by;

\begin{gathered} r=\frac{present\text{ term}}{preceed\text{ ing term}} \\  \\ \text{Hence,} \\ r=\frac{108}{36}=\frac{36}{12}=\frac{12}{4}=\frac{4}{1.33\ldots}=\frac{1.33\ldots.}{0.44\ldots} \\ r=3 \end{gathered}

Therefore, the common ratio is 3.

3 0
1 year ago
A. How much will LaToya pay in taxes for the year? Show your work.
marusya05 [52]
Uhhhuuhhhhhhhhhhuhhh
8 0
2 years ago
WILL GIVE BRAINLIESTTTT and 13 points<br> HELPPPPPPP<br> ONLY QUESTION B)
Leno4ka [110]

Answer:

2(n+1)+2

You start with two greens and two columns of two orange squares while adding two orange squares each time. So, the bolded part is the green squares that stay the same. The 2(n+1) represents the two orange columns that increase by one block on each side per image.

4 0
2 years ago
16. A scientist measured the average flying speeds of 25 species of birds.
garik1379 [7]
The answer would be c
3 0
3 years ago
Read 2 more answers
2. Tom makes $50 a day, 5 days a week. If his rent every four weeks was $500, what is
Hunter-Best [27]
His overall net profit would be $500 dollars because every two weeks he makes $500 so over 4 weeks he would make $1000, but lose $500 to rent.
3 0
3 years ago
Read 2 more answers
Other questions:
  • What is the slope of the line that goes through the points (1, -5) and (4, 1)
    9·2 answers
  • Write this number in expanded form 73,489
    14·2 answers
  • What is the value of 2 in 1,025
    12·2 answers
  • As an estimation we are told 5 miles is 8 km. <br> Convert 37.5 miles to km.
    7·2 answers
  • Factorise <br>a^2-4ab+5b^2-c^2+6bc​
    14·1 answer
  • Kate bad $2,251 in here bank account. Currently, she has $1,958 in her account. What is the approximate percent of decrease in h
    6·1 answer
  • What is the slope of the line equation 7x-3y=21
    14·1 answer
  • What is the correct equilibrium constant expression for this equation? 2 upper C upper o upper F subscript 2 (g) double arrow up
    7·1 answer
  • Given that the line y=ax+b passes through the points A(0; 3) and B(-2;7), how do I find the values of a and b?
    5·1 answer
  • Ten minus one-third of number is 4
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!