number 6 O d S66 000 QUESTION 6 10 points Save Answer According so an IRS study,

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number 6

O d S66 000 QUESTION 6 10 points Save Answer According so an IRS study, t takes 300 minutes sorta payers to completion times folows a normal distritunon and standard deviaton and 325 minutes? fie a 1040A tax retum. The distrbution of 25 minutes What is the likelhood the sample mean is tatwen 290 a 0.3413 c 0.1654 QUESTION 7 Competition shooters were duided by accuracy The stadents were dovided into categorres, above 90% accuracy, beeweer Bo% and up to 90% ammunition used What type of sampling scheme a systema c amping simple random sampang stratfied random sampling

Explanation / Answer

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From information given,Xbar=300,s=25, Substititute Xi with 290 and 325 in th efollowing equation to obtian the respective z scores.

Z1=(Xi-Xbar)/s=(290-300)/25=-0.4, similarly, Z2=(325-300)/25=1

Find areas corresponding o Z scores and subtract the smaller from the larger one.

0.3446-0.3413=0.0033

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