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SOVA2 [1]
3 years ago
14

Gina worked 32 hours at a rate of $24.50 per hour. Which line in the table will help her calculate her income tax for this week?

2014 weekly tax table with all amounts in dollars and cents unless noted - first column If your taxable income is (first column Over, second column But not over), second column And your filing status is single (third column Base tax plus fourth column Rate times fifth column Amount over). Line 1 Over 43, But not over 218, Base tax blank, Rate 10 percent, Amount over 43. Line 2 Over 218, But not over 753, Base tax 17.50, Rate 15 percent, Amount over 218. Line 3 Over 753, But not over 1,762, Base tax 97.75, Rate 25 percent, Amount over 753. Line 4 Over 1,762, But not over 3,627, Base tax 350.00, Rate 28 percent, Amount over 1,762.
A. line 1
B. line 2
C. line 3
D. line 4
Mathematics
1 answer:
Olin [163]3 years ago
6 0
I have a positive feeling it is line 3. Because the final answer I had gotten was 784
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umka2103 [35]

Answer:

a) The expected value is 2.680642

b) The minimun number of newspapers the manager should order is 6.

Step-by-step explanation:

a) Lets call X the demanded amount of newspapers demanded, and Y the amount of newspapers sold. Note that 4 newspapers are sold when at least four newspaper are demanded, but it can be <em>more</em> than that.

X is a random variable of Poisson distribution with mean \mu = 3 , and Y is a random variable with range {0, 1, 2, 3, 4}, with the following values

  • PY(k) = PX(k) = ε^(-3)*(3^k)/k! for k in {0,1,2,3}
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we obtain:

PY(0) = ε^(-3) = 0.04978..

PY(1) = ε^(-3)*3^1/1! = 3*ε^(-3) = 0.14936

PY(2) = ε^(-3)*3^2/2! = 4.5*ε^(-3) = 0.22404

PY(3) = ε^(-3)*3^3/3! = 4.5*ε^(-3) = 0.22404

PY(4) = 1- (ε^(-3)*(1+3+4.5+4.5)) = 0.352768

E(Y) = 0*PY(0)+1*PY(1)+2*PY(2)+3*PY(3)+4*PY(4) =  0.14936 + 2*0.22404 + 3*0.22404+4*0.352768 = 2.680642

The store is <em>expected</em> to sell 2.680642 newspapers

b) The minimun number can be obtained by applying the cummulative distribution function of X until it reaches a value higher than 0.95. If we order that many newspapers, the probability to have a number of requests not higher than that value is more 0.95, therefore the probability to have more than that amount will be less than 0.05

we know that FX(3) = PX(0)+PX(1)+PX(2)+PX(3) = 0.04978+0.14936+0.22404+0.22404 = 0.647231

FX(4) = FX(3) + PX(4) = 0.647231+ε^(-3)*3^4/4! = 0.815262

FX(5) = 0.815262+ε^(-3)*3^5/5! = 0.91608

FX(6) = 0.91608+ε^(-3)*3^6/6! = 0.966489

So, if we ask for 6 newspapers, the probability of receiving at least 6 calls is 0.966489, and the probability to receive more calls than available newspapers will be less than 0.05.

I hope this helped you!

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