1 Ex-1: Frequency Distribution

Steps in construction of frequency distribution:

• Determine the number of classes
  
• Determine the class width
  
• Set up the individual class limits
  
• Tally the items into the classes
  
• Count the number of items in each class

Table below shows the data related to the grain yield in (g /plot) of a sorghum variety from experimental plots of equal area from a continuous frequency distribution. Prepare a frequency distribution and cumulative frequency distribution

194	129	166	164	154	139	128	120	80	168
150	186	156	179	153	157	155	115	676	171
118	143	191	148	152	187	129	119	139	177
191	214	167	165	186	111	155	164	125	99
86	170	111	169	141	164	89	180	225	139
127	136	144	165	154	74	156	142	162	160
171	134	177	178	168	165	188	131	154	107
189	156	176	150	142	144	153	190	183	180
161	170	195	136	91	187	152	145	98	166

SOLUTION:

Number of Classes, k =1 + 3.322 log₁₀N =

Class width, C = | max - min|/ k =

Lower limit as L = min - \(\frac{c^{'} - k^{'} - (max - min)}{2}\) =