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March 1, 2015

March 1, 2015

Posted by **Christina** on Monday, March 18, 2013 at 3:27pm.

A. Find the first quartile for the distribution of GMAT scores.

B. Find the median for the distribution of GMAT scores.

C. Find the ninety-fifth percentile for the distribution of GMAT scores.

- stats. -
**MathGuru**, Monday, March 18, 2013 at 6:17pmA few hints:

A. First quartile is the 25th percentile.

B. Second quartile (median) is the 50th percentile.

C. 95th percentile is most of the distribution.

Find the z-scores using a z-table for each of these percentiles.

Use z-score formula to find the scores at each percentile.

Formula:

z = (x - mean)/sd

mean = 550

sd = 100

Solve for x in each case.

Note: In a normal distribution, the mean, median, and mode are the same.

- stats. -
**Christina**, Tuesday, March 19, 2013 at 11:16pmso would part a be

.4207=(x-550)/100 ?

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