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3 years ago

Solve for b: 2b+11=19

Mathematics

2 answers:

fgiga [73]3 years ago

7 0

Answer:

$b = 4$

Step-by-step explanation:

$2b + 11 = 19$

$2b + 11 - 11 = 19 - 11$

$2b = 8$

$\frac{2b}{2} = \frac{8}{2}$

$b = 4$

Veronika [31]3 years ago

4 0

Answer:

$\Huge \boxed{B=4}$

Step-by-step explanation:

To solve this problem, first you have to isolate b on one side of the equation.

First, subtract 11 from both sides.

$\displaystyle 2b+11-11=19-11$

Solve.

$\displaystyle 19-11=\boxed{8}$

$\displaystyle 2b=8$

Then, divide by 2 from both sides.

$\displaystyle \frac{2b}{2}=\frac{8}{2}$

Solve.

$\displaystyle 8\div2=\boxed{4}$

$\large\boxed{\textnormal{Therefore, the correct answer is \boxed{b=4}}}}}.$

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The number of surface flaws in plastic panels used in the interior of automobiles has a Poisson distribution with a mean of 0.05

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Answer:

(a) Probability that there are no surface flaws in an auto's interior is 0.6065 .

(b) If 10 cars are sold to a rental company, what is the probability that none of the 10 cars has any surface flaws is 0.00673 .

Step-by-step explanation:

We are given that the number of surface flaws in plastic panels used in the interior of automobiles has a Poisson distribution with a mean of 0.05 flaws per square foot of plastic panel.

Let X = Distribution of number of surface flaws in plastic panels

So, X ~ Poisson( $\lambda$ )

The mean of Poisson distribution is given by, E(X) = $\lambda$ = 0.05

which means, X ~ Poisson(0.05)

The probability distribution function of a Poisson random variable is:

$P(X=x)=\frac{e^{-\lambda}\lambda^{x}}{x!}; for x=0,1,2,3...$

Now, we know that $\lambda$ for per square foot of plastic panel is 0.05 and we are given that an automobile interior contains 10 square feet of plastic panel.

Therefore, for 10 square foot of plastic panel is = 10 * 0.05 = 0.5

(a) Probability that there are no surface flaws in an auto's interior =P(X=0)

P(X = 0) = $\frac{e^{-0.5}*0.5^{0}}{0!}$ = $e^{-0.5}$ = 0.6065