Answer the next three questions with the following table. The relative cumulativ
ID: 3264925 • Letter: A
Question
Answer the next three questions with the following table. The relative cumulative frequency table for the number of hours worked per week by 400 students is shown in this table.
Number of hours
Relative Cumulative Frequency
0 – 9
.05
10 – 19
.25
20 - 29
.75
30 - 39
1.00
The number of students working 19 hours or less is:
a. 80 b. 100 c. 20 d. 25 e. none of these
The number of students working between 20 and 29 hours is:
a. 80 b. 75 c. 200 d. 300 e. none of these
The percent relative frequency of the (20 – 29) class is:
a. 50% b. 30% c. 20% d. 75% e. none of these
Number of hours
Relative Cumulative Frequency
0 – 9
.05
10 – 19
.25
20 - 29
.75
30 - 39
1.00
Explanation / Answer
The number of students working 19 hours or less = 0.25 *400 = 100 (b)
The number of students working between 20 and 29 hours is = (0.75-0.25) *400 = 200 (c)
The percentage relative frequency of the 20 to 29 class is (.74-.25)*100% = 50% (a)
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