a) The following data identifies the diameters of wire taken from 40 reels of cable during a quality test. Each measurement is taken to the nearest one hundredth of a millimetre [micrometer {um)]:-...

It appears my working only for question iii were wrong for mean and standard deviation.

Be interested to see what data you come up for iii only.

Thanks

Extracted text: a) The following data identifies the diameters of wire taken from 40 reels of cable during a quality test. Each measurement is taken to the nearest one hundredth of a millimetre [micrometer {um)]:- 1.28 x 1.37 1.41 1.39 1.27 x 1.36 1.40 1.38 1.28 1.33 1.40 1.32 1.24 X 1.43 1.35 1.34 1.38 1.31 1.36 1.35 1.30 1.36 1.38 1.29 1.26 1.39 1.33 1.37 1.30 1.45 1.35 1.37 1.38 1.42 1.34 1.33 1.42 1.35 1.34 1.38 cumulative frequency distribution. ř Using 8 classes (for example 1.24 - 1.26, 1.27 - 1.29 etc), form a frequency distribution and a H. For the above data, draw a histogram and an ogive. j. From your diagrams identify the median and the modal class. Find the approximate mean and standard deviation.