Mathematics: The average cost of an irs form 1040 tax filing at thetis tax service is $150.00. assuming a normal distribution, if 90 percent of the filings cost less than $172.00, what is the standard deviation? hint: use excel or appendix c-2 to find the z-score. (

The average cost of an irs form 1040 tax filing at

Ответ:

alexandroperez13

01.01.2022

P(Z<z)=0.9 => z=1.281552 from normal probability tables.

z=(x-mean)/standard deviation =>
standard deviation =(x-mean)/z=(172-150)/1.281552=17.17

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Ответ:

tawna6988owtjg6

21.06.2022

Mathematics

yes because 4 times 9 is equal to 36 and 4 times 5 is equal 20

Step-by-step explanation:

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The average cost of an irs form 1040 tax filing at thetis tax service is $150.00. assuming a normal distribution, if 90 percent of the filings cost less than $172.00, what is the standard deviation? hint: use excel or appendix c-2 to find the z-score. (

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