16) An auditor finds an error 36% of the time when examining tax returns. many t

Question

16) An auditor finds an error 36% of the time when examining tax returns. many tenths place if needed. errors? If he examines 2500 tax neturns, how (Hint: binomial) You must show set-up for credit. Round to the A) 360 B) 900 A: 172 Find the standard deviation of the binomial problem above. You must show set-up for credit. Round answ to the tenths place if needed. A) 30 B)576 C)14.4 D) 24 18) Use your answers from the two problems above to help answer the following. If he were examining 25 returns, would it be unusual to for exactly 860 of them to contain an error? Determine if the outcome S unusual. Consider as unusual any result that differs from the mean by more than 2 standard deviatio is, unusual values are either less than -2 or greater than + 2a. You must show work for credit. A) 860 would not be an unusual number of the 2500 tax returns to contain an error because 860 is in B) 860 would not be an unusual number of the 2500 tax returns to contain an error because 860 is n C) 860 would be an unusual number of the 2500 tax returns to contain an error because 860 is in the D) 860 would be an unusual number of the 2500 tax returns to contain an error because 860 is not range of values. ual range of values. range of values usual range of values

Explanation / Answer

Ans:

14)Give that

n=2500

p=0.36

mean=np=2500*0.36=900

Option B is correct.

b)standard deviation=sqrt(np(1-p)=sqrt(2500*0.36*(1-0.36)=24

Option D is correct.

c)Range for to be usual is (900-2*24, 900+2*24)=(852, 948)

As,860 is in the usual range of values,so 860 is not an unsusal number of errors.

Option B is correct.

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