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The following data are the measures of the diameters of 36 rivet heads in 1/100 of an inch.

• 6.72, 6.77, 6.82, 6.70, 6.78, 6.70, 6.62, 6.75, 6.66, 6.66, 6.64, 6.76, 6.73, 6.80, 6.72, 6.76, 6.76, 6.68, 6.66, 6.62, 6.72, 6.76, 6.70, 6.78, 6.76, 6.67, 6.70, 6.72, 6.74, 6.81, 6.79, 6.78, 6.66, 6.76, 6.76, 6.72

(a) Compute the sample mean and sample standard deviation.

(b) Construct a relative frequency by using a class interval of 0.04, and

(c) draw a histogram (bar graph) of the data.