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Blizzard [7]
3 years ago
12

Some electronic devices are better used than new. The failure rate is higher when they are new than when they are six months old

. For​ example, half of the personal music players sold by a particular brand have a flaw. If the player has the​ flaw, it dies in the first six months. If it does not have this​ flaw, then only 20​% fail in the first six months. Yours dies after you had it for three months. What are the chances that it has this​ flaw?
The probability that it has the flaw is ________?
Mathematics
1 answer:
erastova [34]3 years ago
6 0

Answer:

Step-by-step explanation:

Given that half of the personal music players sold by a particular brand have a flaw. If the player has the​ flaw, it dies in the first six months. If it does not have this​ flaw, then only 20​% fail in the first six months.

Let A be the event that it fails in I 6 months

B1 = it has a flaw

B2 = it does not have a flaw

B1 and B2 are mutually exclusive and exhaustive

the chances that it has this​ flaw

=The probability that it has the flaw is

=P(A/B_1)=\frac{P(B_1/A)P(A)}{P(B_1)} \\=\frac{0.80(P(A))}{0.50}

To find P(A) = P(AB1)+P(AB2)\\=0.5(0.8)+0.5(0.2)\\=0.5

Hence required prob = 0.80

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The owner of a motel has 2900 m of fencing and wants to enclose a rectangular plot of land that borders a straight highway. If s
navik [9.2K]

Answer:

Step-by-step explanation:

Given that the owner of a motel has 2900 m of fencing and wants to enclose a rectangular plot of land that borders a straight highway.

Fencing is used for 2times length and 1 width if highway side is taken as width

So we have 2l+w = 2900

Or w = 2900-2l

Area of the rectangular region = lw

A(l) = l(2900-2l) = 2900l-2l^2\\

Use derivative test to find the maximum

A'(l) = 2900-4l\\A"(l) = -4

So maximum when I derivative =0

i.e when l =\frac{2900}{4} =725

Largest area = A(725)

= 725(2900-2*725)\\= 1051250

1051250 sqm is area maximum

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3 years ago
A little help please
Dominik [7]

Answer: it’s 2, x = 2

Step-by-step explanation:

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6 0
3 years ago
You are making several purchases from the b-better electronics store. You can buy from this store online or in a physical store.
alexandr402 [8]

Answer:

Online Ordering is better.

Step-by-step explanation:

So you now that you save 20% if you to physical store and you save $20 if you go to the online store.

Say you are spending 100 dollars at the store to make it easy. 20% of one hundred is $20 so that is the same amount of money.

Now let’s look at the taxes and shipping so at the physical store you have to pay taxes no matter what but online you only do it if you purchase is less than $75 and we have $80 ($100–$20=$80) so at the physical store you have some amount of Mandy that is more than $80 because of taxes but if you buy online it will be exactly $80.

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3 years ago
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amid [387]
Do you have the tiles and stuff 

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3 years ago
PLEASE HELP 7TH GRADE 100 PTS!!!
MariettaO [177]

f(x) = 5x is linear. Just a straight line with a slope of +5. So if the intervals are both a difference of 1, then the average rate of change will be the same.

f(x2) - f(x1) over x2 - x1. That's the formula for average rate of change.

So for Section A:

f(x) = 5x, (0,1)

[f(1) - f(0)]/(1-0)

= [5(1) - 5(0)]/1

=(5)/1

=5

Do the same for section B and you'll get 5 as well.

I hope this helps you because I have no clue if my answer is right

6 0
3 years ago
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