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
hichkok12 [17]
3 years ago
10

In a batch of 8,000 clock radios 5% are defective. A sample of 14 clock radios is randomly selected without replacement from the

8,000 and tested. The entire batch will be rejected if at least one of those tested is defective. What is the probability that the entire batch will be rejected?
A) 0.488
B) 0.0714
C) 0.512
D) 0.0500
Mathematics
2 answers:
soldier1979 [14.2K]3 years ago
7 0

Answer:

0.512

Step-by-step explanation:

elena55 [62]3 years ago
3 0
1. \frac{5}{100} *8000= 5*80=400 of radios are defective, so           8000-400=7600 work properly.

2. P(entire batch rejected)=P(at least one out of randomly selected 14 is defecive)= 1-P(none of the randomly selected 14 is defective)

3. Lets make the previous point clear. The complement or the opposite of "at least one defective" is "none defective" or "all working".

4. so lets find the probability of 14 being all working:

P(all 14 randomly selected, working)=\frac{7600}{8000}*  \frac{7599}{7999}* \frac{7598}{7998}* \frac{7597}{7997}*...* \frac{7588}{7988}* \frac{7587}{7987}

\frac{7600}{8000}=0.95
\frac{7599}{7999}=0.95
.
.
.
\frac{7587}{7987}=0.95

So it is clear that each of these 14 fractions is very close to 0.95,

P(all 14 randomly selected, working)=0.95*0.95...0.95=(0.95)^{14}= 0.488

(to calculate easily, in your computers calculator, write 0.95, hit *, then hit Enter 13 times)

P(none of 14 selected working)=1-P(all working)=1-0.488=0.512

4. Another solution to P(all working) is \frac{C(7600, 14)}{8000}= \frac{ \frac{7600!}{14!(7600-14)!} }{8000}=  \frac{ \frac{7600!}{14!(7586)!} }{8000}=\frac{ \frac{7600*7599*7598*...*7587*7586!}{14!(7586)!} }{8000}

=\frac{ \frac{7600*7599*7598*...*7587}{14!} }{8000}

here we need to multiply all the numbers from 7600 to 7587 and then divide by 14, by 13.....1. This result then is divided by 8000, and what we get, is substracted from 1.

5. The principles discussed, of at least one of the solutions, should be clear at this level of problem.
You might be interested in
Leah gets paid $795 biweekly. What is the recommended monthly rent that she can afford?
Pepsi [2]

I would say since thats $1500+ a month about 600 dollars, because she will have bills and then have to buy food drinks and alot more.

3 0
2 years ago
Read 2 more answers
Find the slope of the line graphed in the diagram and choose the correct answer from the choices below. The two intercepts are (
kvasek [131]
The correct slope is -5/2.

The formula for slope is

m = (y₂-y₁)/(x₂-x₁)

The y-coordinate of the second point is 0, and the y-coordinate of the first point is 2.  The x-coordinate of the second point is 0.8 and the x-coordinate of the first point is 0:

m = (0-2)/(0.8-0) = -2/0.8 = -2 ÷ 8/10 = -2 × 10/8 = -2/1 × 10/8 = -20/8 = -5/2
3 0
3 years ago
A recipe calls for 5 deciliters of water and 236 milliliters of milk. How many milliliters of liquid does the recipe call for in
DanielleElmas [232]
The recipe calls for 736 milliliters of liquid in total.
5 0
3 years ago
Read 2 more answers
Help me please I got to finish it
Scorpion4ik [409]

Answer:

\frac{52}{63}

4 0
2 years ago
Andy wrote the following statement
Fantom [35]
Andy is incorrect because more then one triangle can be drawn with the given information
7 0
3 years ago
Read 2 more answers
Other questions:
  • 2x-4 (x-4)=-2+3x+3 what's the value of x
    11·2 answers
  • 3x+4y=12 and 2x-y=8. Which ordered pair is a solution to the system of equations?
    10·1 answer
  • Rayhana has a coupon for 15% off a single item at a store. If the item has a regular price of p dollars, then the sale price can
    13·2 answers
  • The first three terms of a geometric sequence are as follows.
    11·2 answers
  • Find the equation of the axis of symmetry for the parabola<br> y = x2 + 6x + 9
    8·1 answer
  • Explain how to model 32% on a 10-by-10 grid. How does the model represent ratio of 32 to 100.
    6·1 answer
  • Write an inequality that represents 10 less than a 4 times a number more than 10,000
    13·2 answers
  • How many edges does this shape have?
    6·1 answer
  • Suppose you waited 10 years to invest in the same retirement fund and have the same $400,000 for retirement at the same 8% inter
    13·1 answer
  • A random sample of 432 voters revealed that 100 are in favor of a certain bond issue. A 95 percent confidence interval for the p
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!