Data: Student's body weight (kg): 41 60 72 72 65 64 48 90 60...

Data: Student's body weight (kg): 41 60 72 72 65 64 48 90 60 75 53 48 63 49 58 39 39 75 55 62 53 59 58 38 72 62 60 59 68 60 70 60 56 80 65 85 71 45 70 55 1. Make a stem-and-leaf display 2. Consider 6 as the desired number of classes. Make a frequency distribution table Class Frequency Cumulative Frequency Relative Frequency Percentage Cumulative Percentage

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00:01 Okay, so if we collect all this data and order it and we put it into a stem and leaf diagram, then on the stems we put the tens units.

00:09 So we're going from 38 up to 90.

00:12 So we're going to start with 3, 4, 5, 6, 7, 8 and 9.

00:18 And then if we put in all our values in the three group, we have 38, 39 and 39.

00:28 In the 40s we've got 41, 45, 48, 48 and 49.

00:34 In the 50s we've got 53, 53, 55, 55, 56, 58, 58, 59 and 59.

00:47 In the 60s we've got five 60s.

00:52 And then we've got two 62s, a 63, 64, two 65s and a 68.

01:03 In the 70s we've got two 70s, a 71, three 72s and two 75s.

01:12 In the 80s we've got 80 and 85 and the 90s we've got 90.

01:17 So that's our stem and leaf display, that was question one.

01:19 Question two then says to make a frequency distribution table for this set of data.

01:25 So we want six classes.

01:28 We can see here that we're going to do something that looks like 30 to 40, 40 to 50, 50 to 60, 60 to 70, 70 to 80 and 80 to 90, because it only goes up to 90.

01:45 So we want that last one to be inclusive of 90.

01:47 So we're going to do 31 to 40, inclusive, 41 to 50, 51 to 60, 61 to 70, 71 to 80 and 81 to 90.

02:23 And we're going to be doing, so we can ignore this at the top now, we're going to be doing the frequency, which is simply the number of counts in that column...

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