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
castortr0y [4]
3 years ago
5

The time taken to assemble a laptop computer in a certain plant is a random variable having a normal distribution of 20 hours an

d a standard deviation of 2 hours.What is the probability that a laptop computer can be assembled at this plant in a period of time
a)Less than 19.5 hours?
b)Between 20 hours and 22 hours?

Mathematics
1 answer:
ludmilkaskok [199]3 years ago
4 0

Answer:

a) 40.13% probability that a laptop computer can be assembled at this plant in a period of time of less than 19.5 hours.

b) 34.13% probability that a laptop computer can be assembled at this plant in a period of time between 20 hours and 22 hours.

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question:

\mu = 20, \sigma = 2

a)Less than 19.5 hours?

This is the pvalue of Z when X = 19.5. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{19.5 - 20}{2}

Z = -0.25

Z = -0.25 has a pvalue of 0.4013.

40.13% probability that a laptop computer can be assembled at this plant in a period of time of less than 19.5 hours.

b)Between 20 hours and 22 hours?

This is the pvalue of Z when X = 22 subtracted by the pvalue of Z when X = 20. So

X = 22

Z = \frac{X - \mu}{\sigma}

Z = \frac{22 - 20}{2}

Z = 1

Z = 1 has a pvalue of 0.8413

X = 20

Z = \frac{X - \mu}{\sigma}

Z = \frac{20 - 20}{2}

Z = 0

Z = 0 has a pvalue of 0.5

0.8413 - 0.5 = 0.3413

34.13% probability that a laptop computer can be assembled at this plant in a period of time between 20 hours and 22 hours.

You might be interested in
What is the equivalent of 243 to the power of (2/5)
nasty-shy [4]

<span>(243)^(2/5) = ?
---
The 5 in the denominator means "take the 5th root".
The 2 in the numerator means "square".

---


</span><span>Taking the 5th root first you get:
(243)^(2/5) = 3^2
Now squaring gives you
3^2 = 9

So the answer is 9.

Hope this helps :)
~Davinia.
</span>

6 0
2 years ago
Integer Basics
Furkat [3]
Can you retype whatever you’re asking in this please?
7 0
3 years ago
Verdadero o falso: Q (números racionales) ∩ I (números irracionales) = Ø. Porque?
ozzi

Answer:

I think true but can u translate to english so I could understand

7 0
3 years ago
Help me please help me help please me please pleases me please please help
kifflom [539]

Answer:

the answer is 15/14 when you add them

7 0
2 years ago
Read 2 more answers
Which of the following correctly names a side of the triangle below?
slamgirl [31]

Answer:

C. \frac{}{AB}

Step-by-step explanation:

You can solve this in two ways, firstly by eliminating all the wrong answers, and secondly by just knowing that the horizontal line in _\frac{}{AB} means that we are talking about a line.

This is how we solve this question by using the eliminating process.

(A. ∠C) is not the right answer because the ∠ sign lets us know that this answer represents an angle, not a line

(B. <em>B) </em>is not the right answer because it represent a point, not a line (in math we use a singular capital letter to represent points)

(D. ΔABC) is not the right answer because the Δ sign lets us know that the answer represents a triangle, not a line.

Therefore, the only option left is C. \frac{}{AB}

4 0
3 years ago
Other questions:
  • Translate the word phrase into a math expression.
    10·2 answers
  • What is 69.12 rounded to the nearest tenth
    9·1 answer
  • 6 4/5 of what number is 1 7/10 <br> Show your work
    6·1 answer
  • A total of $12,000 is invested at two different rates: $5,000 of it is invested at 6%, and the rest is invested at 8%. How much
    11·1 answer
  • How do I simplify 7(3x + 9=
    10·2 answers
  • An item has a listing price of $95. If the sales tax rate is 7%,how much is the sales tax (in dollars)?
    14·1 answer
  • Brenda bought five hats. A week later half
    13·1 answer
  • how long will the other side be ?
    8·1 answer
  • Please help me with these two problems thank you!!​
    14·1 answer
  • What are the answers for
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!