Spider silk is the strongest known material, natural or man-made, on a weight basis. A study examined the mechanical properties of spider silk using 21 female golden orb weavers, Nephila clavipes. The data on silk yield stress represent the amount of force per unit area needed to reach permanent deformation of the silk strand. The data are expressed in megapascals (MPa). 164.0, 478.7, 251.3. 351.7, 173.0, 448.9, 300.6. 362.0, 272.4, 740.2, 329.0, 327.2, 270.5, 332.1, 288.8, 176.1, 282.2, 236.1, 358.2, 270.5, 290.7 Access the complete dataset, click the link for Excel and open in a new window or tab: Excel Use the Excel file attached to compute the mean . Round to one decimal place