Hi Tutors,

Please help me in this assignment in my managerial statistics subject.

Following are 60 measurements (in 0.00001 inch) of the thickness of an aluminum alloy plating obtained in the analysis of an anodizing process:

24	24	41	36	32	33	22	34	39	25	21	32
36	26	43	28	30	27	38	25	33	42	30	32
31	34	21	27	35	48	35	26	21	30	37	39
25	33	36	27	29	28	26	22	23	30	43	20
31	22	37	23	30	29	31	28	36	38	20	24

Group these thicknesses into distribution with the classes 20-24, 25-29, 30-34, 35-39, 40-44, and 45-49.

1. Prepare a Tally Sheet
2. Determine the upper and lower limit
3. Mid-point of the class interval
4. Total frequency (up)

Thank you.