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Posted by on Thursday, May 24, 2012 at 9:02pm.

Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55. The standard deviations for English and Maths
were 10 and 8 respectively. In which subject did Charlotte perform better? Explain your decision.

  • Maths B - , Friday, May 25, 2012 at 3:11pm

    Z score = score in terms of standard deviations.

    Z = (score-mean)/SD

    Which Z score is highest?

  • Maths B (More) - , Friday, May 25, 2012 at 3:12pm

    For explanation, find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores.

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