Example 11. Acollar manufacturer is considering the production of a new type of collar to attract young men. The following statistics of neck circumferences are available based upon the measurements of typical group of college students: Mid-value No. of students Mid-value No. of students (inches) (inches) 4 19 30 63 66 15.0 15.5 16.0 29 18 1 12.5 13.0 13.5 14.0 14.5 16.5 Compute the mean, the standard deviation and variance.

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