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dalvyx [7]
3 years ago
15

How many times does 89 go into 249 equally

Mathematics
2 answers:
konstantin123 [22]3 years ago
4 0

Answer:  2

Step-by-step explanation:

If you do 249/89 you will get 2.79775280899

so 89 goes into 249 2 times equally

Margarita [4]3 years ago
3 0

Answer:

2

Step-by-step explanation:

If you do 249/89 you will get 2.79775280899

so 89 goes into 249 2 times equally

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16. From past experience, a company has found that in cartons of transistors, 92% contain no defective transistors, 3% contain o
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Answer:

E(x)=0.15

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Step-by-step explanation:

The mean of a discrete variable is calculated as:

E(x)=x_1*p(x_1)+x_2*p(x_2)+...+x_n*p(n)

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:

E(x)=(0*0.92)+(1*0.03)+(2*0.03)+(3*0.02)=0.15

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.

At the same way, the variance V(x) is calculated as:

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:

E(x^2)=(0^2*0.92)+(1^2*0.03)+(2^2*0.03)+(3^2*0.02)=0.33\\V(x)=0.33-(0.15)^2\\V(x)=0.3075

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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3 years ago
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