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alukav5142 [94]
3 years ago
15

Suppose that your mom gives you $20 to go to the school supplies store. there is a 6% sales tax on supplies. you need to buy the

following items:pencils = $1.29notebook binder = $5.99paper = $3.49high-lighter pens = $2.35a. how much will the supplies cost?
b. how much change will you receive?
Mathematics
1 answer:
almond37 [142]3 years ago
8 0
20 times .06. Then you add that to 20. Subtract the total of all the supplies needed from 21.20. That will equal your change. Then subtract 9.37 from 21.20. That will be the cost.  <span />
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Consider a t distribution with 7 degrees of freedom. Compute P(-1.29 &lt; t &lt; 1.29). Round your answer to at least three deci
ss7ja [257]

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b) -1.73406361

Step-by-step explanation:

a)

Consider a t distribution with 7 degrees of freedom. Compute P(-1.29 < t < 1.29)

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P(-1.29 < t < 1.29) = 1 - TDIST(1.29,7,2) = 1 - 0.23802914 = 0.76197086

In OpenOffice Calc, the function is the same replacing “,” with “;”  

That is

P(-1.29 < t < 1.29) = 1 - TDIST(1.29;7;2) = 0.76197086

b)

Consider a t distribution with 18 degrees of freedom. Find the value of c such that P(t≤ c) = 0.05

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TINV(p*2,n) with p>0 gives the point c such that the area of the t distribution with n degrees of freedom to the right of c is p.  

Since <em>the t distribution is symmetric with respect to 0</em>, -c would be a point such that the area to the left of -c is p.

So we want to compute  in Excel

-TINV(0.05*2,18) = -1.73406361

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-TINV(0.05*2;18) = -1.73406361

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