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2 years ago

What is the domain and range of this graph

Mathematics

1 answer:

zvonat [6]2 years ago

8 0

Man just pay attention in school

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lana66690 [7]

Answer:

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Step-by-step explanation:

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4 0

3 years ago

our buses carrying 140 high school students arrive to Montreal. The buses carry, respectively, 31, 43, 27, and 39 students. One

Vinvika [58]

Answer:

V(X)= 39.10

V(Y)= 40

Step-by-step explanation:

Given that

Total number of student = 140

Bus A - 31

Bus B- 43

Bus C- 27

Bus D- 39

The probability that a student was on the bus is proportional to the number of student. Eg 31/140 in bus A, 43/140 on bus B, ...

E(X) = (31*31/140) + (43*43/140) + (27*27/140) + (39*39/140)

= 35.5

$Var(X) =(31-35.5)^2 \times \dfrac{31}{140}+(43-35.5)^2 \times \dfrac{43}{140}+(39-35.5)^2 \times \dfrac{39}{140}+(27-35.5)^2 \times \dfrac{27}{140}$

V(X)= 39.10

The bus driver have 1/4 probability on being on any of the buses.

E(Y) = 140/4 = 35

$Var(Y)=\dfrac{(35-31)^2+(35-43)^2+(35-27)^2+(35-39)^2}{4}$

V(Y)= 40

7 0

3 years ago

Which number is halfway between 1/2 and 5/6?

AnnyKZ [126]

Are there choices??!??

8 0

3 years ago

84 points + brainliest if well explained and correct:

anygoal [31]

The ratio of false positives to false negatives is (d) 3.5

<h3>How to determine the ratio?</h3>

The table of values is given as

Activates. Does not activate Row Totals

Lightning in area 88% 2% 90%

No lightning in area 7% 3% 10%

Column Totals 95% 5% 100%

The false negative is when there is lighting and it does not activate

So, we have

False negative = 2%

The false positive is when there is no lighting and it activates

So, we have

False positive = 7%

When represented as ratio, we have

Ratio = 7% : 2%

So, we have

Ratio = 7 : 2

This gives

Ratio = 7/2

Evaluate

Ratio = 3.5

Hence, the ratio is (d) 3.5