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
Alborosie
3 years ago
5

A factory makes tennis balls. Every tennis ball must meet a quality standard, or it will be rejected. The percentage that meets

the quality standard is 99.8%. If 20,000 tennis balls are made, then about how many are expected to be rejected?
Mathematics
1 answer:
Anettt [7]3 years ago
3 0
The answer you're looking for is 40 tennis balls.
Hope this helped!
You might be interested in
How much time will it take for a bug to travel 5m across the floor if it is traveling at 0.5m/s?
goldenfox [79]

Answer:

10 seconds

Step-by-step explanation:

Every second the bug travels 0.5m/s or 0.5 meters per second.

Given that, every 2 seconds the bug will travel a full 1 meter.

To solve this one can simply divide 5m by 0.5 and get 10 seconds.

5 0
3 years ago
How does knowing 8+5=13 help you solve 13-5?​
amid [387]

Answer:

Fact Families

Step-by-step explanation:

They are fact families

8 0
2 years ago
Read 2 more answers
Earn 100 points for this question and a brainiest
padilas [110]

Answer:

the answer is C

Step-by-step explanation:

\frac{7}{7}  -  \frac{4}{7}  +  \frac{2}{7}

6 0
2 years ago
Read 2 more answers
18. cos t(sec t - cos t)
Margarita [4]
\bf sin^2(\theta)+cos^2(\theta)=1\implies sin^2(\theta)=1-cos^2(\theta)\\\\
sec(\theta)=\cfrac{1}{cos(\theta)}
\\\\
-----------------------------\\\\
cos(t)[sec(t)-cos(t)]\implies cos(t)sec(t)-cos(t)cos(t)
\\\\\\
cos(t)\cdot \cfrac{1}{cos(t)}-cos^2(t)\implies 1-cos^2(t)\implies \boxed{sin^2(t)}
8 0
3 years ago
Consider a system with one component that is subject to failure, and suppose that we have 115 copies of the component. Suppose f
castortr0y [4]

Answer:

Step-by-step explanation:

From the given information:

the mean (\mu) = 115 \times 20

= 2300

Standard deviation = 20 \times \sqrt{115}

Standard deviation (SD) = 214.4761

TO find:

a) P(x > 3500)= P(Z > \dfrac{3500-\mu}{214.4761})

P(x > 3500)= P(Z > \dfrac{3500-2300}{214.4761})

P(x > 3500)= P(Z > \dfrac{1200}{214.4761})

P(x > 3500)= P(Z >5.595)

From the Z-table, since 5.595 is > 3.999

P(x > 3500)=1-0.9999

P(x > 3500) = 0.0001

b)

Here, the replacement time for the mean (\mu) = \dfrac{0+0.5}{2}

= 0.25

Replacement time for the Standard deviation \sigma = \dfrac{0.5-0}{\sqrt{12}}

\sigma = 0.1443

For 115 component, the mean time = (115 × 20)+(114×0.25)

= 2300 + 28.5

= 2328.5

Standard deviation = \sqrt{(115\times 20^2) +(114\times (0.1443)^2)}

= \sqrt{(115\times 400) +(114\times 0.02082249}

= \sqrt{(46000) +2.37376386}

= \sqrt{(46000) +(2.37376386)}

= \sqrt{46002.374}

= 214.482

Now; the required probability:

P(x > 4125) = P(Z > \dfrac{4125- 2328.5}{214.482})

P(x > 4125) = P(Z > \dfrac{1796.5}{214.482})

P(x > 4125) = P(Z >8.376)

P(x > 4125) =1-  P(Z

From the Z-table, since 8.376 is > 3.999

P(x > 4125) = 1 - 0.9999

P(x > 4125) = 0.0001

7 0
2 years ago
Other questions:
  • Find the value of x such that sin (90-x) = cos 50
    8·2 answers
  • What is the method to the problem
    13·1 answer
  • The price of a video game system was $359. The price decreased to $199. What is the percent decrease on the price of this system
    5·1 answer
  • At the beginning of the month, Hercules had 96 violas in his store. He sold 9 violas during the month. What is the ratio of the
    15·1 answer
  • SOMEONE, PLEASE HELP
    14·1 answer
  • What's 2|–9| – |–2|? Question 14 options: A) –18 B) –20 C) 16 D) 20
    6·1 answer
  • Find the quotient and remainder.
    9·2 answers
  • (Please DO NOT answer unless you have the CORRECT ANSWER)
    11·2 answers
  • Can you help me find X
    8·2 answers
  • I need help please!
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!