Mathematics, 23.09.2019 16:20 lexybellx3

He number of surface flaws in plastic panels used in the interior of automobiles has a poisson distribution with a mean of 0.02 flaws per square foot of plastic panel. assume an automobile interior contains 10 square feet of plastic panel. (a) what is the probability that there are no surface flaws in an auto's interior? (b) if 10 cars are sold to a rental company, what is the probability that none of the 10 cars has any surface flaws? (c) if 10 cars are sold to a rental company, what is the probability that at most 1 car has any surface flaws? round your answers to four decimal places (e. g. 98.7654).

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Answer from: 2005briana

a) 81.8731% probability that there are no surface flaws in an auto's interior.

b) 13.5336% probability that none of the 10 cars has any surface flaws

c) 43.4967% probability that at most 1 car has any surface flaws

Step-by-step explanation:

To solve this question, we need to understand the Poisson and the binomial probability distribution.

Poisson distribution:

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.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

Poisson distribution with a mean of 0.02 flaws per square foot of plastic panel. Assume an automobile interior contains 10 square feet of plastic panel.

This means that $\mu = 0.02*10 = 0.2$

(a) What is the probability that there are no surface flaws in an auto's interior?

Single vehicle, so we use the Poisson distribution.

This is P(X = 0).

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

$P(X = 0) = \frac{e^{-0.2}*(0.2)^{0}}{(0)!} = 0.818731$

81.8731% probability that there are no surface flaws in an auto's interior.

(b) If 10 cars are sold to a rental company, what is the probability that none of the 10 cars has any surface flaws?

81.87% probability that there are no surface flaws in an auto's interior. So p = 0.8187.

10 cars, so n = 10

This probability is P(X = 10), that is, all the cars without flaws.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 10) = C_{10,10}.(0.818731)^{10}.(1-0.818731)^{0} = 0.135336$

13.5336% probability that none of the 10 cars has any surface flaws

At least 9 cars without flaws, so

$P(X \geq 9) = P(X = 9) + P(X = 10)$

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 9) = C_{10,9}.(0.818731)^{9}.(1-0.818731)^{1} = 0.299631$

$P(X = 10) = C_{10,10}.(0.818731)^{10}.(1-0.818731)^{0} = 0.135336$

$P(X \geq 9) = P(X = 9) + P(X = 10) = 0.299631 + 0.135336 = 0.434967$

43.4967% probability that at most 1 car has any surface flaws

Answer from: Quest

if gloria has "carry over" minutes, (that is, any minutes paid for but not used in a month can be applied to her payment for minutes in the next month,) her total usage for the three months is: total minutes = 320 + 243 + 489 = 1052 minutes number of 200 minute blocks = 1052/200 = 5 r52 (that is 5 with a remainder of 52) rounding up the number of 200 minute blocks gives her usage for the three months as 6 blocks. the cost for six blocks is 6 x $25 = $150 she also has 200 - 52 or 148 carry over minutes if gloria pays each month and unused minutes are lost, applying the rounding up procedure to each month gives: first month usage of 320 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 second month usage of 243 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 third month usage of 489 minutes rounds up to 3 blocks of 200 minutes for a payment of 3 x $25 = $75 total payments for the three months are $50 + $50 + $75 = $175 get the plan with carry over minutes!

Answer from: Quest

c- 36

taxicab circle radius 9 has 4(9) = 36 points

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