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3 years ago

2z - 17 4z + 6 9z - 2 Total

Mathematics

1 answer:

Nadusha1986 [10]3 years ago

7 0

Answer:

-103z - 2

Step-by-step explanation:

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Let X be the random variable representing the number of calls received in an hour by a 911 emergency service. A portion of the p

ivolga24 [154]

For any distribution, the sum of the probabilities of all possible outcomes must be 1. In this case, we have to have

$P(X=0)+P(X=1)+P(X=2)+P(X=3)+P(X=4)=1$

We're told that $p=P(X=1)=P(X=2)$ , and we're given other probabilities, so we have

$0.25+2p+0.10+0.05=1\implies2p=0.6\implies p=0.3$

The expected number of calls would be

$E[X]=\displaystyle\sum_xx\,P(X=x)$

$E[X]=0\,P(X=0)+1\,P(X=1)+\cdots+4\,P(X=4)$

$E[X]=1.4$

6 0

3 years ago

Please help, I need these done today TT

Nutka1998 [239]

Answer:

Hilda needs 64 ft² of tile

8601 in² will be uncovered post mounting

Step-by-step explanation:

Ar=10•6=60 ft²

At=[4•2]/2=8/2=4 ft²

total area=Ar+At=60+4=64ft²

......

Atv=31•57=1767 in²

Aw=(12•8)•(9•12)=10368 in²

Au=Aw-Atv=10368-1767=8601 in²

7 0

3 years ago

Rewarding brainly (dont get mad if i dont do it right away

jeyben [28]

32 units

Uhh- i just graphed the ordered points and it indeed formed a rectangle. I counted how many units are around the rectangle cus thats what perimeter is. Its 32 units

Ita not quite complicated tho. Have a nice day

6 0

3 years ago

Read 2 more answers

Working her way through school, Julie works two part-time jobs for a total of 35 hours a week. Job A pays $6.10 per hour, and Jo

geniusboy [140]

Answer:

Julie worked 18 hours at Job A and 17 hours at Job B.

Step-by-step explanation:

1. Let's review the data given to us for solving the question:

Rate per hour at Job A = US$ 6.10

Rate per hour at Job B = US$$ 7.40

Hours at Job A = x

Hours at Job B = 35 - x

Total of hours worked by Julie = 35 hours

Total weekly earnings = US$ 235.60

2. How many hours did she work at each job the week that she made $235.60?

For finding the result, we will use the following formula:

6.10x + 7.4 (35 - x) = 235.60

6.10x + 259 - 7.4x = 235.60

-1.3x = 235.60 - 259 (Subtracting 259 to both sides)

-1.3x = - 23.40

x = -23.4/-1.3 (Dividing by -1.3)

x = 18

Julie worked 18 hours at Job A, so she worked 17 (35 - 18) hours at Job B.

3. Proof that x = 18 is correct.

6.10x + 7.4 (35 - x) = 235.60

6.10 (18) + 7.4 (35 - 18) = 235.60

109.80 + 125.80 = 235.60

235.60 = 235.60

It's proven that x = 18 is correct.

6 0

3 years ago

Read 2 more answers

-5(2e-3d)+1=91 d=4 Solve for e

Sergio039 [100]

-5(2e-12)+1=91
-5(2e)+60+1=91
-5(2e)=30
2e=-6
e = -3

8 0

3 years ago