IQ Scores	Frequency	Cumulative Frequency
50-69	23
70-80	249
90-109		0.722
110-129
130-149	25
Total	1000

The frequency distribution below shows the distribution for IQ scores for a random sample of 1000 adults. (Show all work. Just the answer, without supporting work, will receive no credit.)

(a) Complete the frequency table with frequency and cumulative relative frequency. Express the cumulative relative frequency to three decimal places.

(b) What percentage of the adults in this sample has an IQ score of at least 110?

(c) Which of the following IQ score groups does the median of this distribution belong to?

70 89, 90 109, or 110 129? Why?