Question

help on 13,14,15,16

standard deviation to find the Be sure to note for questions 13-16, you do not need the mean or Z-score. 13. Find the Z-score that describes the following proportions under the normal curve (within 0.01 points): Top 38% of scores,38 14. Find the Z-score that describes the following proportions under the normal curve (within 0.01 points): Bottom 15% of scores 15. Find the Z-score that describes the following proportions under the normal curve (within 0.01 points): Top 65% of scores (be careful!) 16. Find the Z-score that describes the following proportions under the normal curve (within 0.01 points): Middle 30% of scores (around the mean of Z-0)

Answer 1

Hello Sir/ Mam

(a)

z-score of Top 38% of the scores = z-score of bottom 62% = 0.3055 (Using "=NORM.S.INV(0.62)")

(b)

z-score for bottom 15% of scores = -1.0364 (Using "=NORM.S.INV(0.15)")

(c)

z-score of Top 65% of the scores = z-score of bottom 35% = -0.3853 (Using "=NORM.S.INV(0.35)")

(d)

z-scores of middle 30% means z-score of 35% and 65% = -0.3853 (Using "=NORM.S.INV(0.35)") or 0.3853 (Using "=NORM.S.INV(0.65)")

I hope this solves your doubt.

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