The table above shows the distribution of test scores for a

Hi Stne,
To find median of test-scores,we have to arrange them in an order (ascending or descending) and find the middle term.Now,the middle term is 37 th term in the order.

For the score distribution ,one can add one more column Cumulative frequency

SCORE INTERVAL---------NUMBER OF SCORES --------- Cumulative Frequency

50-59-------------------------- 2----------------------------- 2
60-69--------------------------10---------------------------- 12
70-79--------------------------16-----------------------------28
80-89--------------------------27-----------------------------55
90-99--------------------------18-----------------------------73

We can see arranging the scores in ascending, shows first 28 test scores are below 80.
Next 27 scores , i.e. 29th,30th,....,37th,......,55th score appear in SCORE INTERVAL 80-89.
So median is in interval 80-89.
Hope it helps.

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