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
stira [4]
3 years ago
8

A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 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 9.1 hours.
Mathematics
1 answer:
djyliett [7]3 years ago
8 0

Answer:

The probability is 0.0069

Step-by-step explanation:

First thing to do here is to calculate the z-score

Mathematically;

z-score = (x-mean)/SD/√(n)

where x = 9.1 , mean = 8.4 , SD = 1.8 and n = 40

Plugging these values into the z-score equation, we have;

z-score = (9.1-8.4)/1.8/√(40) = 0.7/1.8/6.325 = 0.0615

Now, we check the standard normal table for P(z > 2.46) = 0.0069

You might be interested in
Determine f(-a) where f(x) = x2 - 6x and simplify.
jeka57 [31]

Answer:

6a

Step-by-step explanation:

replace x with -a

-2a -6(-a)

-2a +8a

6a

5 0
2 years ago
95i is a root of f(x)=x^2 +9025. find the other roots of f(x)
Alex_Xolod [135]

Answer:

Other root is -95i

Step-by-step explanation:

Here, Nature of roots of f(x) is imaginary roots.

Therefore, Roots are conjugate of each other.

Conjugate of x + yi is x - yi.

we get conjugate of 95i as -95i

Verification shows....

(x-95)(x+95i)=0

{x }^{2}  -  {95}^{2}  {i}^{2}  = 0 \\  {x }^{2}   + {95}^{2} = 0  \\ {x }^{2}   + 9025= 0   \\ f(x) = 0

this, roots are -95i and 95i

5 0
3 years ago
180% if what number is 36
elena-s [515]

Answer:

64.8

Step-by-step explanation:

7 0
3 years ago
A polynomial has two terms.
alexira [117]
Not sure if that is the entire question, but yes, it does. Poly comes from the Greek polus or polloi meaning much or many.
3 0
3 years ago
What is the value of n?<br><br><br><br> n–2=10n+42
Bingel [31]

Answer:

N= -44/9 Hope this helped, <3

Step-by-step explanation:

Let's solve your equation step-by-step.

n−2=10n+42

Step 1: Subtract 10n from both sides.

n−2−10n=10n+42−10n

−9n−2=42

Step 2: Add 2 to both sides.

−9n−2+2=42+2

−9n=44

Step 3: Divide both sides by -9.

5 0
3 years ago
Read 2 more answers
Other questions:
  • Is triangle TAG ~ BAG? If so, identify the similarity postulate or theorem that applies.
    10·3 answers
  • A die of unknown bias is rolled 20 times, and the number 3 comes up 6 times. In the next three rounds (the die is rolled 20 time
    13·1 answer
  • I need help with 1, 3 and 5 help pls
    14·2 answers
  • The triangles are similar. What is the value of x? Enter your answer in the box. <br><br>x =
    9·1 answer
  • Find the missing side length in the image attached.
    13·2 answers
  • Please help me with this! ASAP
    12·1 answer
  • Help me please!! I will mark Brainliest!!!!
    14·2 answers
  • Factorise ab-a-b+1 =?
    14·2 answers
  • HELP DUE SOON EMERGENCY
    15·1 answer
  • The first five terms of a quadratic sequence is 1,8,21,40,65 .
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!