A random sample of 500 students was chosen from UMUC STAT 200 classes. The frequency distribution below shows the distribution for study time each week (in hours). (Show all work. Just the answer, without supporting work, will receive no credit.)
Study Time (in hours)
Frequency
Relative Frequency
0.0 – 5.0
40
5.1 – 10.0
100
10.1 – 15.0
0.25
15.1 – 20.0
120
20.1 – 25.0
Total
500
(a) Complete the frequency table with frequency and relative frequency. Express the relative frequency to two decimal places.
(b) What percentage of the study times was not more than 15 hours?
(c) In what class interval must the median lie? 5.1 – 10.0, 10.1 -15.0, 15.1 – 20.0, or 20.1 – 25.0?
Why?
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