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3 years ago

Simplify this expression b+2+5b

Mathematics

2 answers:

ivann1987 [24]3 years ago

5 0

b+5b because they are like terms which equals to 6b so the answer is 2+6b

balu736 [363]3 years ago

4 0

OK so we combine like terms so 5b+b= 6b and then we write it all together so your answer will be 6b+2

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Step-by-step explanation:

The mean of a discrete variable is calculated as:

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where $x_1,x_2,...,x_n$ are the values that the variable can take and $p(x_1),p(x_2),...,p(x_n)$ are their respective probabilities.

So, if we call x the number of defective transistors in cartons, we can calculate the mean E(x) as:

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Because there are 0 defective transistor with a probability of 0.92, 1 defective transistor with a probability of 0.03, 2 defective transistors with a probability of 0.03 and 3 defective transistors with a probability of 0.01.

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$V(x)=E(x^2)-(E(x))^2$

Where $E(x^2)=x_1^2*p(x_1)+x_2^2*p(x_2)+...+x_n^2*p(n)$

So, the variance V(x) is equal to:

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Finally, the standard deviation is calculated as:

$S(x)=\sqrt{V(x)} \\S(x)=\sqrt{0.3075} \\S(x)=0.5545$

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