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Stat Help Please

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1)A runner's finishing time translated into a z-score of z=2.6

Explain in words whether the runner performed excellently or poorly?

2)Yearly stock returns on India's Sensex Index are well described by a Normal model with a mean of 18.36% and a standard deviation of 14.65%. give the stock return cutoff for the middle 30% of all years.

  • Stat Help Please -

    z-scores mainly range between -3 and 3
    z = 2.6 is near the upper end.

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