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Please can you help me. Im struggling to get my head around this. I have calculated the class width to be 4.9-4.3/6= 0.1 I have arranged the data into 6 equal classes: 4.3-4.4, 4.4-4.5, 4.5-4.6, 4.6-4.7, 4.7-4.8, 4.8-4.9.  Is this correct? To determine the frequency distribution, do I include  only those values equal to of greater than the first figure, but less than the second figure? For example,  with the class intervals Ive listed above, would the frequency for 4.3-4.4 group be 1 as there is only one value of 4.3 in the given data?  In that case, should I have 7 groups ( 4.9-5.0) so the value of 4.9 is included ? I'm confused as Ive asked this question several times and keep being told different answers . Please help me.

An intelligence test that has a maximum time for completion of 45 minutes was recently administered to a group of 21 people. Their respective times for completion (in minutes) were as follows. 22, 29, 31, 31, 31, 33, 36, 36, 37, 37, 37, 37, 37, 41, 41, 41, 42, 42, 43, 43, 44 Send data to calculator Send data to Excel Frequency 8. 8. 7 6- 4 4 2. 1 20 25 Time for completion (in minutes) 30 35 45 40