Question

Use the following scenario and data for all the questions A random sample of 30 scores is selected from the scores obtained on an online homework of all students taking an introductory business statistics courses. The scores are shown in the following. Note that the sample data are not sorted in any order 37 42 333 44 25 28 37 3 40 34 37 32 24 46 48 37 35 33 38 41 38 35 22 27 32 36 47 Using the intervals in the following table, find the frequency, class midpoint, cumulative frequency, relative frequency and cumulative relative frequeney for each class. Then answer the following questions Interval Frequency Midpoint Frequency Frequenecy Frequency Class Cusulative Relative Relative Cumulative 20-under 25 25- under 30 30-under 35 35-under 40 40- under 45 45- under 50 Total The frequency of the class with the interval 45-under 50 is

Answer 1

class	f	class-midpoint	cumulative freq	relative freq	cumulative relative freq
20-24.5	2	22.5	2	0.066666667	0.066666667
25-29.5	4	27.5	6	0.133333333	0.2
30-34.5	7	32.5	13	0.233333333	0.433333333
35-39.5	9	37.5	22	0.3	0.733333333
40-44.5	5	42.5	27	0.166666667	0.9
45-49.5	3	47.5	30	0.1	1
	30

1)
f for 45- under 50= 3
2)
cumulative frequency = 22
3)
class mid-point = 47.5
4)
relative frequency for 20-25 = 0.0666
5)cumulative relative frequency for 40-45 = 0.9