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A survey of 18 high-technology firms showed the number of days' inventory of concrete rebar's they...

A survey of 18 high-technology firms showed the number of days' inventory of concrete rebar's they ermine if the data are approximately normally distributed. 6 30 35 45 46 64 69 75 75 82 8992 98 99 114 119 152 159
math   Statistics-And-Probability   
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a) The data must be arranged in ascending order X 6 30 35 45 46 64 69 75 75 82 89 92 98 99 114 119 152 159 The range of the vari able is Range - Maximum- Minimum 159- 6 153 R 153 (b) Class Interval The formula for calculating the class interval is Class Interval= Range Number of classes 153 - 51 Class Interval51 The Computati on Table Class Interval Frequency 6-57 57-108 108-159 4

(c) The step-by-step instructions to obtain frequency histogram is obtained by using Excel 2010 * Store the data Class interval, frequency in the columns of the Excel2010 worksheet Select the Entire range of the data Choose Îsert → Column → 2-D column * Select the Form at data series and series options *Reduce the Gap wi dth to zero. *Choose Design and chart layouts and then select 8th chart layout. * Click Close. The Frequency Histogram using Excel2010

The frequency histogram 10 4 L 2 0 6-57 57-108 108-159 Class interval

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