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A 2012 study of freely forming groups in bars all over Europe examined the natural behavior of groups. The researchers recorded the group size (number of individuals in the group) of all 501 groups in the study that were naturally laughing. The findings were displayed in the figure below. 300 254 250 200 168 150 Number of groups 100 50 52 21 6 0 2 3 4 5 6 Laughter group size

          A 2012 study of freely forming groups in bars all over Europe examined the natural behavior of groups. The researchers recorded the group size (number of individuals in the group) of all 501 groups in the study that were naturally laughing. The findings were displayed in the figure below. 300 254 250 200 168 150 Number of groups 100 50 52 21 6 0 2 3 4 5 6 Laughter group size
        
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A 2012 study of freely forming groups in bars all over Europe examined the natural behavior of groups. The researchers recorded the group size (number of individuals in the group) of all 501 groups in the study that were naturally laughing. The findings were displayed in the figure below. 300 254 250 200 168 150 Number of groups 100 50 52 21 6 0 2 3 4 5 6 Laughter group size

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Elementary Statistics a Step by Step Approach
Elementary Statistics a Step by Step Approach
Allan G. Bluman 9th Edition
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The distribution of group size in this sample of naturally laughing groups is clearly bimodal. The laughter groups ranged in size from 2 to 300, with a median value of 52. The median laughter group size in this study is less than the mean. Based on these findings, we can conclude that in European bars in 2012, smaller groups were more likely than larger groups to be naturally laughing.
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Transcript

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00:01 To find the percentage of laughing groups that had more than four individuals, we need to add the probabilities of x being five or six.
00:52 So we get the probability of x being greater than four equals the probability of x equals five plus the probability of x equals six.
01:10 This gives us the probability that x is greater than four equals 0 .04 plus 0 .01...
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