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Ede4ka [16]
3 years ago
15

A population has a mean of 40 and a standard deviation of 15. a sample of size 100 is taken at random from this population. the

standard deviation of the sampling distribution of sample mean equals:
Mathematics
1 answer:
krok68 [10]3 years ago
3 0
Theirs alot of people in this world so watch out.

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Maths help please!!!!!!
ddd [48]

Answer:

VW = √2

Step-by-step explanation:

y = x+1

x²+y²+2x+2y+1=0          (x²+2x+1) + (y²+2y+1) = 1

(x+1)² + (y+1)² = 1  : Circle: (x-h)² + (y-k)² = r²     Center (O): (h , k) = (-1 , -1) r = 1

solve for roots: x²+(x+1)²+2x+2(x+1)+1=0

2x² + 6x + 4 = 0          x²+3x+2=0

(x+1)(x+2)=0

x = -1 or x = -2

y = 0 or y = -1

V and W: (-1 , 0) and (-2 , -1)  forms a 90° center angle

√vw = √1²+1² = √2

4 0
3 years ago
NEED HELP ASAP<br> Solve 4 – x = –8.
Anna71 [15]

Answer:

i think it is 12 positive

Step-by-step explanation:

i think

4 0
3 years ago
In the floor tile pattern, the figure is a square and the two triangles are congruent.
Licemer1 [7]

Answer:

7.1

Step-by-step explanation:

Since it is a square you can use the Pythagorean theorem (a²+b²=c²) by filling in what you know. a²=5 and b²=5 so you have 5²+5²=c². This simplfies to 25+25=c². Now you simplify again to get 50=c². Finally you have to square root everything because the equation can't end in c², it has to be the most simplified it can be. This equals ≈7.1

8 0
2 years ago
????????????????????????????
rewona [7]

Let h equal the number of hours the electrician works.

We can write the equation like this:

90h + 60 = 600

Solve for h.

90h + 60 = 600

~Subtract 60 to both sides

90h + 60 - 60 = 600 - 60

~Simplify

90h = 540

~Divide 90 to both sides

90h/90 = 540/90

~Simplify

h = 6

Therefore, the electrician work for 6 hours.

The correct answer is Option 1.

Best of Luck!

7 0
3 years ago
Read 2 more answers
Jack deposited a check into his account for $227.21. Then, he withdrew $227.21 in cash in the same transaction. What is the net
Slav-nsk [51]
454.42, it’s the net about of the money before anything is deducted
5 0
3 years ago
Read 2 more answers
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