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tatiyna
3 years ago
6

the probability that your ticket will be chosen in a drawing is 6% there are 250 tickets in the drawing how many tickets are you

rs
Mathematics
1 answer:
julsineya [31]3 years ago
6 0
No the answer should be 15 tickets. 250x0.06=15. number of tickets multiplied by percentage (in decimal form) to find what 6% of 250.
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A certain kind of sheet metal has, on average, 3 defects per 18 square feet. Assuming a Poisson distribution, find the probabili
Fofino [41]

Answer:

75.8% probability that a 31 square foot metal sheet has at least 4 defects.

Step-by-step explanation:

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}

In which

x is the number of sucesses

e = 2.71828 is the Euler number

\mu is the mean in the given time interval.

In this problem, we have that:

3 defects per 18 square feet.

So for 31 square feet, we have to solve a rule of three

3 defects - 18 square feet

x defects - 31 square feet

18x = 3*31

x = \frac{31*3}{18}

x = 5.17

So \mu = 5.17

Assuming a Poisson distribution, find the probability that a 31 square foot metal sheet has at least 4 defects.

Either it has three or less defects, or it has at least 4 defects. The sum of the probabilities of these events is decimal 1.

So

P(X \leq 3) + P(X \geq 4) = 1

We want P(X \geq 4)

So

P(X \geq 4) = 1 - P(X \leq 3)

In which

P(X \leq 3) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3)

P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}

P(X = 0) = \frac{e^{-5.17}*(5.17)^{0}}{(0)!} = 0.0057

P(X = 1) = \frac{e^{-5.17}*(5.17)^{1}}{(1)!} = 0.0294

P(X = 2) = \frac{e^{-5.17}*(5.17)^{2}}{(2)!} = 0.0760

P(X = 3) = \frac{e^{-5.17}*(5.17)^{3}}{(3)!} = 0.1309

So

P(X \leq 3) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) = 0.0057 + 0.0294 + 0.0760 + 0.1309 = 0.242

Finally

P(X \geq 4) = 1 - P(X \leq 3) = 1 - 0.242 = 0.758

75.8% probability that a 31 square foot metal sheet has at least 4 defects.

8 0
3 years ago
Write the inequality that represents the​ sentence, ​"Four less than a number is greater than 58​."​
puteri [66]

Answer:

n-4>58

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
9=ln(x+7) | Solve for x
frez [133]
Remember that ln=log_{e}
and

log_{a}x=y means a^y=x
convert
ln(x+7)=9 means
e^(9)=x+7
minus 7 from both sides
e^9-7=x
use calculator to evaluate
8096.08=x aprox
8 0
2 years ago
A pom-pom manufacturer makes each of its pom-poms with 35% white strands (w), 25% blue strands (b), and 40% red strands (r). If
s344n2d4d5 [400]

Answer:

White: 28 Blue: 20 Red: 32

Step-by-step explanation: Make ratios. If 35% are White strands then it would be 35/100 = ?/80 you can use the butterfly method to solve this:

35*80 = ?*100

? = 28

Blue: 25/100 = ?/80

(you can use the butterfly method or you can simplify 25/100 into 1/4)

1/4 = ?/80

1*80 = ?*4

? = 20

Red: 40/100 = ?/80 (once again, you can simplify if you want)

4/10 = ?/80

4*80 = ?*80

? = 32

7 0
3 years ago
Read 2 more answers
Look at the sceenshot-- help??
Burka [1]
The answer is: 3.
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In the table, the relation (x, y) is not a function is the "missing value" of "x" is: 3.
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The "missing value" refers to the "empty box" in the table shown (in the attached screenshot).  The "empty box" shows a "y-coordinate" of "20"; but a "missing" corresponding "x-coordinate".
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The problem asks: 
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In the table, the relation (x, y) is not a function is the "missing value" of "x" is: ____?
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3.
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Additional information:
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4 0
3 years ago
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