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3 years ago

12

You want to estimate the number of students in a junior high school who ride the school bus. Which sample is unbiased? PLEASE HE

LP!!!

1 answer:

Tanzania [10]3 years ago

8 0

I would say C. This is because these students are the first 50 who are on the roster & has nothing to do with either side.

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A manager at a local company asked his employees how many times they had given blood in the last year. The results of the survey

Lubov Fominskaja [6]

Answer:

$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

$Sd(X) =\sqrt{2.3779}= 1.542 \approx 1.54$

Step-by-step explanation:

For this case we have the following distribution given:

X 0 1 2 3 4 5 6

P(X) 0.3 0.25 0.2 0.12 0.07 0.04 0.02

For this case we need to find first the expected value given by:

$E(X) = \sum_{i=1}^n X_i P(X_I)$

And replacing we got:

$E(X)= 0*0.3 +1*0.25 +2*0.2 +3*0.12 +4*0.07+ 5*0.04 +6*0.02=1.61$

Now we can find the second moment given by:

$E(X^2) =\sum_{i=1}^n X^2_i P(X_i)$

And replacing we got:

$E(X^2)= 0^2*0.3 +1^2*0.25 +2^2*0.2 +3^2*0.12 +4^2*0.07+ 5^2*0.04 +6^2*0.02=4.97$

And the variance would be given by:

$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

$Sd(X) =\sqrt{2.3779}= 1.542 \approx 1.54$

8 0

3 years ago

HELP PLZS FAST BRAINIEST

kirill115 [55]

Answer:

x=-2, y=-2. (-2, -2).

Step-by-step explanation:

2x-5y=6

-2x+10y=-16

-------------------

5y=-10

y=-10/5=-2

2x-5(-2)=6

2x+10=6

2x=6-10

2x=-4

x=-4/2=-2

3 0

2 years ago

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Please help me!!!!!!

Ivan

Answer:

please the answer is the third option

7 0

2 years ago

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Find the product of the monomial and the polynomial. 4a^2b^3*(9a^4b^2-4a^2+3)

Artemon [7]

Answer:

Step-by-step explanation:

4a² b³ * (9a⁴b² - 4a² + 3) = 4a²b³ * 9a⁴b² - 4a²b³*4a² + 4a²b³*3

= 36a²⁺⁴ b³⁺² -16a²⁺²b³ + 12a²b³

= 36a⁶b⁵ - 16a⁴b³ + 12a²b³

6 0

2 years ago

BRAINLIEST, THANKS AND 5 STARS IF ANSWERED CORRECTLY.

statuscvo [17]

B has two pre-images of -7 so it is not a function

6 0

3 years ago

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