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Greeley [361]
3 years ago
5

Every day, the number of network blackouts has a distribution (probability mass function)

Mathematics
1 answer:
boyakko [2]3 years ago
3 0
Expected Mean, E(X), is obtained by multiplying each pair of x and its P(x) and add up the answers

E(X) = (0×0.7) + (1×0.2) + (2×0.1) = 0.4

The formula to calculate the variance, Var(X), is given by E(X)² - (E(X))²

E(X²) = (0²×0.7) + (1²×0.2) + (2²×0.1) = 0+0.2+0.4 = 0.6
(E(X))² = (0.4)² = 0.16

Var(X) = 0.6 - 0.16 = 0.44

Translating these answers into the context we have

E(Y) = 0.4×500 = $200
Var(Y) = $110

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Cristy has ten pets including cats, birds, and hamsters. She has twice as many hamsters as cats.
marysya [2.9K]
6 hamsters, 3 cats, and 1 bird = 38 legs.

6H + 3C + 1B = 30

H = 4 C = 4 B = 2

6*4 + 3*4 + 1*2 = 38

Hope this helped :)
6 0
3 years ago
A post it note has an area of A square inches. The width of the post it note is 4 inches.which equation represents X the length
SVEN [57.7K]

Answer:

Option C. X=A/4

Step-by-step explanation:

we know that

The area of the rectangular post it note is equal to

A=LW

where

L is the length

W is the width

In this problem we have

W=4\ in

L=X\ in

substitute

A=4X

solve for x

That means ----> isolate the variable x

Divide by 4 both sides

X=\frac{A}{4}

6 0
3 years ago
What are compatible number of 7233 divided by 84
valkas [14]
To me, do the math using compatible number, means to estimate
7233 can round to 8000
and 84 can round to 80
now, this makes it easy, you can do it mentally, which is 100

In more detailed, 
7233 can round to 7225
and 84 can round to 85
then, (not so obvious, but however) 85 times 85 equal 7225

so the compatible number of 7233 divided by 84, is 7225 and 85

I know it's a bit late, but hope it helps
4 0
2 years ago
1. A local fast food restaurant takes in $10,000 in a 5 hour lunch period. Write a
Leto [7]

Answer:

8hours

Step-by-step explanation:

10000÷5=2000

so the restaurant earns 2000$ per hour

8×2000=16000

8hours=16000$

Hope that helped

6 0
3 years ago
Can someone help me with number 1 and 2? I just need to know what to do please!!
max2010maxim [7]
 1) is 1        2)      2 is 8.60   4 is 10.00  5 is 24.00
6 0
3 years ago
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