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  • hdennen 9 years ago + 0 comments

    For those as confused as I was: Here's a handy z chart. And here's a good explanation of how to find these areas.

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    • odomontois 9 years ago + 0 comments

      Answer with decimal presicion more than 3 was not accepted as R script nor as plain text. However there are no mentions of 3 digit requirement in the problem statemtnt.
      Is there a reason for not rounding answers automatically while testing?

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      • tp0411 9 years ago + 1 comment

        isnt the answers 0.993

        0.959

        0.394 giving me WA

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        • AffineStructure 9 years ago + 1 comment

          Hey tp,
          you need to round the first value, not truncate.
          for the second value, its wrong. your zscore should be greater than -2.25

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          • redhoyasa 9 years ago + 0 comments

            Do you mean the first value is 0.994?

            I've tried both of them (rounded and truncated), but none of them is work

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        • mah66 9 years ago + 0 comments

          You can use wolfram alpha as well. P(..

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          • JustBetweenUs 9 years ago + 1 comment

            why does the below code give me run time error? How can it be faster?

            pnorm(40,mean=30,sd=4)
            pnorm(21,mean=30,sd=4, lower.tail=False)
            pnorm(35,mean=30,sd=4)-pnorm(30,mean=30,sd=4)
            

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            • AffineStructure 9 years ago + 0 comments

              In my R console "False" is invalid, but "F" is valid

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