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25 February, 08:59

The mean finish time was 185.52 with a standard deviation of 0.327 minute. The winning car driven by chris finished in 185.13. The previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. The winning car that year driven by Karen finished in 110.13 minutes. Find their respective z-scores.

Chris - Z-Score

Karen " - Z-Score

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Answers (1)
  1. 25 February, 09:21
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    Chris: - 1.1315.

    Karen: - 1.6038.

    Step-by-step explanation:

    The z-score = (x - m) / d where m = the mean, d = the standard deviation and x is the individual score.

    Chris: z-score = (185.13 - 185.52) / 0.327

    = - 1.1315.

    Karen: z-score = (110.13 - 110.3) / 0.106

    = - 1.6038.
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