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2 years ago

A principal wants to find out how many hours per week the students in the school spend

Mathematics

1 answer:

malfutka [58]2 years ago

3 0

I think B (Every fifth student from each grade)

A only talks about female students, C talks about students on a sports team which would be biased since the students on the sports team probably get more exercise, and d would be ok but not the best since some last names are more common and others you would get only a very small sample size.

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Solve the system of equations. 2x + 7y =3 <br>x = -4y <br>x = <br>y =

dimaraw [331]

Answer:

x = 3/2−7y/2

Step-by-step explanation:

hope this is correct

8 0

2 years ago

A police department reports that the probabilities that 0, 1, 2, and 3 burglaries will be reported in a given day are 0.53, 0.40

SpyIntel [72]

The mean of the probability distribution is given by the expected value given by

$E(x)=\sum xp(x) \\ \\ =0(0.53)+1(0.40)+2(0.05)+3(0.02) \\ \\ =0.40+0.10+0.06=0.56$

The variance of the probability distribution is given by

$Var(x)=(x-\bar{x})^2p(x) \\ \\ =(0-0.56)^2(0.53)+(1-0.56)^2(0.40)+(2-0.56)^2(0.05)\\+(3-0.56)^2(0.02) \\ \\ =(-0.56)^2(0.53)+0.44^2(0.40)+1.44^2(0.05)+2.44^2(0.02) \\ \\ =0.3136(0.53)+0.1936(0.40)+2.0736(0.05)+5.9536(0.02) \\ \\ =0.166208+0.07744+0.10368+0.119072=0.4664$

The standard deviation is given by

$\sigma(x)=\sqrt{Var(x)} \\ \\ =\sqrt{0.4664}=0.683$

5 0

2 years ago

Sales tax in your community is 5. 25 cents for each dollar spent. What is the total cost at the movies for three tickets at

Montano1993 [528]

Answer:

33.94

Explanation:

First start off by finding the total regardless of the 5.25 cents.

(3x8.50)+(3x1.25)+(2x1.50)=32.25

Then take that answer and multiply by your 5.25 cents per dollar

32.25x.0525 (since we're dealing with money)

then add that answer to the original 32.25

8 0

1 year ago

Iſh – 93 + 2 when h<br> 9 and j = 8

Sophie [7]

Answer:

i dont know rhe naswer sorry bro just wanted tondo some chilll and poll

7 0

3 years ago

Therootsoftheequation5x2 −2x+1=0are

pshichka [43]

Answer:

No Solution

Step-by-step explanation:

We can use the quadratic formula to solve for the answer.

x=2+- $\sqrt{4-20}$ /10

Since the discriminant is negative, there is no solution

5 0

2 years ago