A shipment of marbles with a mean diameter of 27 mm and a standard deviation of 0.15 mm is normally distributed. By how many standard deviations does a marble with a diameter of 26.85 mm differ from the mean?
Wouldn't you put this into a ratio? .15/27=x/26.85 Cross multiply and divide. 26.85*.15=4.0275 4.0275/37=.10885 Then the ratio would be .11mm if you round
