Question 1166991
i get:
mean = 2.848485 rounded to 6 decimal places.
standard deviation = 1.416835 rounded to 6 decimal places.


1.5 standard deviations below the mean would be equal to:


2.848485 - 1.5 * 1.416835 = .7232325


round that to 3 decimal places to get .723.


the derivation of the mean and the standard deviation is shown below:


<img src = "http://theo.x10hosting.com/2020/101205.jpg" >